9A Unit1基础练习
一、单项选择
( ) 1.It often makes us _______ to share things with others.
A. feel well
B. feel good
C. to feel well
D. to feel good
( ) 2.Not only the students but their teacher _______ curious about the strange animal after hearing about it.
A. was
B. were
C. is
D. are
( ) 3.Both Lucy and Lily _______invited to Millie’s party yesterday.
A. is
B. was
C. were
D. be
( ) 4.We should pay attention to _______ the teacher carefully.
A. listen to
B. listening to
C. listen
D. listening
( ) 5.The sentence you must pay attention to _______ on the blackboard.
A. writing
B. being written
C. will write
D. will be written
( ) 6.To learn English well, we should spend as much time as we can _______ English.
A. practice speaking
B. practice to speak
C. practicing speaking
D. practicing to speak
( ) 7.His friends found _______ to tell him everything that had happened.
A. it necessary
B. it is necessary
C. that necessary
D. that's necessary
( ) 8.You needn't worry about _______ a meal this evening. I'm going to invite you to a restaurant.
A. to have not
B. having not
C. not having
D. not to have
( ) 9.—Do you mind _______ here? —You'd better not.
A. me smoking
B. my smoking
C. my friend smoking
D. All of the above ( )10. —It’s dangerous to walk across the street carelessly.
—You’re right. We can’t be careful while crossing the street.
A. so
B. very
C. too
D. more
( )11. — Would you like a cup of coffee or a bottle of juice?
—. I’d like some milk.
A. Either
B. Both
C. None
D. Neither ( )12. — Did you enjoy the outdoor training yesterday?
— No, not at all! I was dead after so much hard training.
A. as good as
B. as well as
C. so good as
D. so well as
( )13. — Our monitor Jack is good at all the subjects, but he never .
— What a modest student!
A. gets off
B. takes off
C. puts off
D. shows off ( )14. We may meet all kinds of difficulties in the future, but we should be confident enough to any challenge.
A. put on
B. get on
C. take on
D. try on
( )15. The railway Qinghai to Tibet is the longest plateau (高原) railway in the world.
A. connected
B. connects
C. connecting
D. is connected
( )16. — People born under the same animal sign always have similar hobbies and personalities.
—I think that’s just a coincidence (巧合).
A. Yes, I agree with you.
B. That’s true.
C. I’m afraid I can’t agree.
D. You are right in some ways.
( )17. —Mum, I don’t want to learn the piano anymore. It’s too difficult.
—Dear, don’t . I’m su re you will succeed.
A. wake up
B. stay up
C. give up
D. end up
( )18. Daniel is creative and thoughtful. He can often good ideas.
A. pay attenti on to
B. put up with
C. catch up with
D. come up with
( )19.—Thank you for the delicious food.--__________.
A. I’m glad you enjoyed it
B. It doesn’t matter
C. I don’t think it’s good
D. Don’t say so. ( ) 20._________of his parents is in good health, but _________of them work hard.
A. None ;all
B. Neither ;both
C. Neither ;either
D. Both ;neither
( )21 Do you know why he didn’t _________ a word when he ______ to?
A.Speak , speaks
B. say, was spoken
C. say, spoke
D. speak, is spoken
( )22. The teacher finds him_____ and gives him some different homework to do every day.
A. was clever
B. was a clever boy
C. a clever boy
D. clever boy
( )23. What colour do you think_____ you feel calm?
A. making
B. makes
C. to make
D. make
( )24.In our school there are 1203 students __________.
A. of all
B. after all
C. at all
D. in all
( )25.We _____ into five groups to go to the old people’s home. We did many things to cheer them up.
A. divided
B. are divided
C. were divided
D. divide
( ) 26.Thanks for _____ the new chairperson.
A. recommend me as
B. recommending me as
C. recommend me for
D. recommending me for
( ) 27.—Look at _________ sculpture, Jack! How do you like it?
—This is ________ most wonderful one I have ever seen.
A. the; a
B. a; the
C. the; the
D. a; a
二、词汇运用：
A.词形变换:
1.Neither his parents nor he ______________ (think) he can make a accountant.
2.We shouldn't do anything with _______________ (careless).
3.Kind and polite people are always ________________ (respect).
4.He is the chief engineer of the high-speed railway ____________ (connect) the two countries.
5.Sam often comes up with different kinds of ideas. He is ______________. (create)
6. Li Ming and his parents go to see his grandparents at a (fix) date every month.
7. Jack used to be a bright and (live) boy, but now he is always silent.
8. Premier Zhou Enlai devoted all his life to (work) for our country and people.
9. Eddie shouldn’t worry about ______________(not have) supper.
10.. David is worrying about his_____________(able) to do all the extra work.
11..Andy，could you express ________ (you) well?
12.To us ,a miss is as ___________(best)as a mile.
13.Look! The teenagers are making cards __________(show) love for their mothers.
14.The teacher devoted all his life to ___________(study) how to teach well.
15. _________(practice ) experience is often very important.
B.根据汉语提示填入一个合适的单词，使句子完整正确：
1. Jim’s father is a (总的) manager in a big computer company.
2. The product of this company has reached the international (标准), so it sells well all over the world.
3. When the star (出现) on the stage, the fans all screamed excitedly.
4. If the telephone line is(连接) to your computer, you can get online.
5. The bus company provided(额外的) buses because there were too many people.
6.It's a big ______________ (挑战)for us to cross the dangerous bridge every day.
7.The boy is ______________ (好奇的) about everything in his new school.
8.Sometimes the doctor is _____________ (不耐烦的)with these patients. .
9.Do you think your partner’s personality is ______________（合适的) for a surgeon?
10.His sculptures for our school have won high _______________ (赞扬) from all of us.
11.His father is an ________________(会计) in a big company.
12.Dogs are ___________( 忠诚的) animals.
13.I am very glad to make a _________________(演讲) here in this classroom again.
14.Tom is ill , so he is _______________(缺席) today.
三、完形填空
Every morning, I walked past a security guard (保安). He greeted ___1____ that walked by him. I wondered ___2____ he knew so many people by their first names. The first few times I saw him, I didn't say ___3____back to him when he greeted me. I was lost ___4____ my own world.
One Monday he __5___, "How was your weekend?" I told him about my visit to my sick, elderly___6____. "The time I___7____with my mother is so precious（珍贵）, because I know that each time could be the last."
He told me how sorry he was for my mother's sickness.
He shared how he had lost a parent to illness, too. "I ___8____what you are going through. I ___9____my father every day. "
As I walked away, I realized I did not even know his ___10____.The following___11____, I asked, "What's your name?" He answered, "Gary". I said, "I'm Deborah". After that, we talked several times a week. We ___12____ stories about our weekend, our dreams, and our families.
Gary got another job and moved away. It's been years ___13___ I last spoke to him, __14___it seems like just yesterday we talked.
I ____15___ at what became a friendship of sharing stories from the heart.
When you say hello to a stranger you become a pebble (鹅卵石) in the pond(池塘). With each ripple (涟漪) you create, you spread love that continues to give. Make a point of saying hello to a stranger today. You will give the gift that keeps on giving.
( ) 1. A. everyone B. someone C. anyone D. no one
( ) 2. A. what B. when C. where D. how
( ) 3. A. hello B. sorry C. thank you D. excuse me
( ) 4. A. on B. at C. in D. to
( ) 5. A. said B. told C. talked D. asked
( ) 6. A. father B. mother C. brother D. sister
( ) 7. A. take B. cost C. pay D. spend
( ) 8. A. imagine B. understand C. remember D. believe
( ) 9. A. think about B. think over C. think out D. think of
( ) 10. A. job B. age C. address D. name
( ) 11. A. day B. week C. month D. year
( ) 12. A. told B. made C. shared D. argued
( ) 13. A. until B. since C. before D. after
( ) 14. A. yet B. and C. so D. then
( ) 15. A. look over B. look forward C. look back D. look up
四、阅读理解
A
A driver stopped his car on a street side to have a rest. When he sat in the seat and closed his eyes, a pedestrian (行人) came up and knocked at his window to ask the time. The driver opened his eyes and looked at his watch, “It is 8 o’clock.” He s aid. Then he went to sleep again. But soon he woke up because a second pedestrian was knocking at the window, “Sir, do you have the time?” he asked. The driver looked at his watch again and told the man it was 8:30.
If it happened again, he could not have a good rest. So he wrote a short note and put it on the window for all the people to see. It said, “I don’t have the time.”
Again the man sat in the seat and slept. A few minutes later a third pedestrian came along and began knocking at the window. “Hey, sir,” she said, “It’s 8:45.”
（）1. The driver stopped his car to __________.
A. have breakfast
B. have a rest
C. have lunch
D. tell time
（）2. The first pedestrian knocked at his window to __________.
A. wake him up
B. take his car
C. ask the time
D. buy his car
（）3. Why did the driver write a note and stick it on the window？
A. Because he didn't want anybody to trouble him．
B. Because he didn't know the time．
C. Because he needed somebody to wake him up．
D. Because he wanted somebody to tell him the time.
（）4. Why did the third pedestrian come along and begin knocking at the window?
A. She wanted to know the time.
B. She thought the driver was ill.
C. She wanted to wake the driver up.
D. She knew the time and wanted to tell the driver. （）5. Which of the following sentences is TRUE?
A. The driver slept well in his car.
B. The driver had a good rest in his car.
C. The third pedestrian was kind-hearted but the driver wouldn’t think so.
D. The driver would be happy when the third pedestrian told him the time.
B
Some people think only school children do not agree with their parents, however, it is not true.
Communication is a problem for parents and children of all ages. If it’s hard for you to communicate with your parents, don’t worry about it. Here are some advice for you to bridge the generation gap (代沟).
Don’t argue (争辩) with your parents. Don’t get to your parents when you are angry. Your parents probably won’t consider your ideas if you are shouting at them. And you can’t express yourself well if you are angry. Go someplace to cool off. Make sure you understand why you are unhappy. Then think about what you want to say to your parents. If you don’t think you can speak to them at the moment, try writing a letter.
Try to reach a compromise (和解). Perhaps you and your parents disagree on something. You can keep your disagreement and try your best to accept each other. Michael’s mother didn’t agree with him about buying a motorcycle. They argued over it. But they finally came to a compromise. Michael bought the motorcycle, but only drove it on certain days.
Of course, your parents might refuse to compromise on something. In these situations, it is especially important to show love and respect to them. Showing respect will keep your relationship strong.
Talk about your values. The values of your parents are probably different from those of your own. Tell your parents what you care about, and why. Understanding your values might help them see your purposes in life.
A good relationship with your parents can make you a better and happier person. It is worth having a
try!
( ) 1. According to the passage who have a communication problem?
A. parents and other people
B. only school kids and their parents
C. teachers and their students
D. parents and children of all ages
( ) 2. How many pieces of advice does the writer give us to bridge the generation gap?
A. 5.
B. 4.
C. 3.
D. 2.
( ) 3. The unde rlined word “bridge” in the passage means “______”.
A. 建立
B. 消除
C. 通过
D. 到达
( ) 4. If the values of your parents are different from those of yours, you’d better ______.
A. argue with them
B. keep away from them
C. agree with them all the time
D. tell your parents what you care about
( ) 5. The best title for the passage is______.
A. How to bridge the generation gap
B. How to deal with family problems
C. How to be good parents
D. How to be a good child
C
According to scientists’ research, the month in which babies are born could affect them in some ways.
Babies born in spring get sick easily. Children born under Aquarius (Jan. 21st—Feb. 19th) may be less clever than those born in other seasons. They may also have shorter lives than those born in autumn. Scientists believe many of the differences can be explained by the mother’s exposure to sunlight in pregnancy(怀孕). Sunlight helps lead to the production of vitamin D in the body. The lack(缺乏) of vitamin D in the first months of life may have a bad effect on health.
Vitamin D is called the “sunshine vitamin”. It has a good effect on health. A study showed that people born from April to June had slightly shorter lives than those born in October, November or December. Similar studies in the US showed that people born in autumn lived about 160 days longer than those born in spring.
Professor Russell Foster said the conclusions were surprisi ng and interesting. He added, “These are small effects but they are very, very clear. I am not giving voice to star signs and they are just for fun. But it is true that we are affected by our season of birth.”
( )1. A child’s season of birth can affect a ll the following things EXCEPT according to the first two paragraphs.
A. his health
B. his height
C. his length of life
D. his quality of being clever ( )2. What does the underlined word “exposure” mean in Chinese?
A. 偏爱
B. 抗拒
C. 过敏
D. 暴露( )3. What can we know about vitamin D according to the passage?
A. It comes from sunlight.
B. It helps people live longer.
C. Sunlight prevents its production.
D. It does harm to people’s health.
( )4. Which of the following is TRUE according to the passage?
A. Women should get enough sunlight in pregnancy.
B. Children born under Aquarius are cleverer than those born in autumn.
C. People born in May will live longer than those born in October.
D. Professor Russell Foster is interested in star signs and believes in them.
( )5. What does the passage mainly tell us?
A. People can know the length of life by star sign.
B. Women should choose to give birth to children in spring.
C. A child’s season of birth has a n effect on him or her.
D. Vitamin D is very important to people’s health.
五、阅读下面短文，根据短文内容完成文章所缺信息，每空一词。
Is there someone you hate? Well, maybe you don’t really hate them. But you get really angry every time you think of them .If you don’t let this anger go , it can turn into bitterness(痛苦) .
Bitterness appears when we can’t forgive someone who has hurt us or made us angry .Someone might say or do something that hurts us . But instead of controlling the anger , we keep it deep inside .Before long ,a bitter feeling begins to grow .We may think we’re hurting that person by criticizing(指责)him or her often , but we’re really only hurting ourselves .
Bitterness can not only lead to serious health problems such as heart disease, but also hurt our relationships with friends and family members .No one enjoying being around an angry person for very long .
If you see bitterness in your life ,here are some ways to deal with it .
Accept it
Instead of trying to deny(否认) your anger , make it clear to yourself and accept it .See your anger for what it is and quickly deal with it .
Stop making excuses for it .
You may feel you have a right to be angry .You may think you’re right and the other person is wrong .You may even secretly enjoy making the other person look bad ,but in the end , bitterness hurts you much more than the other person .The bitterness will hold you back , and the other person will go
on with his or her life .
Forgive and forget it
You probably can’t completely put the anger out of your mind , but you can decide to forgive the other person .Forget it and move on .You’ll enjoy better health and peace of mind .
六、缺词填空
1
Dear Mr. Wu
I am writing to (1) r Wu Yan as the new monitor of our class. I think she will be an excellent monitor because she has many good personal qualities. Wu Yan is very (2) p and she never gives up (3) e.
Wu Yan is also a (4) h person. She is always (5) r to help others. She often does (6) e
work for our class. This is very important. If the monitor can think much of (7) o, the other students will be glad to listen to her. Wu Yan is also a (8) c person. She always gets good marks in her tests. All the subjects (9) s very easy to her.
I think Wu Yan has all the qualities a good monitor should have. I hope that you can (10)a with me.
Yours sincerely
2
Are you a shy person? Shyness means feel ing nervous when you’re around other people. Some children are b____1____ shy. Some become shy later because of their life experience. In fact, everybody gets a little shy sometimes. It’s just how much they feel shy.
Most people have red faces and talk in b___2___ sentences when they are shy. But some become so shy that they won’t go to a restaurant because they are too nervous to o___3___ and pay for their food. Some are afraid of meeting s___4_____ people, so they s___5____ go outside. This kind of shyness can be bad for a person.
If shyness doesn’t stop you from doing something you want to do, being shy isn’t a big p____6____. Some experts（专家）say shy people are good at working because they think more and t___7____ less.
But remember not to let good opportunities (机会) p___8___ you by just because of it. If you have to sing a song at a birthday party or make a s___9___ in front of others, just do it. There’s n___10__ to be afraid of.
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9A Unit1基础练习答案
一、单项选择
BACBD CACDC DADCC CCDAB BCBDC BC
二、词汇运用：
A、词形变换:
1. thinks
2. carelessness
3. respected
4.connecting
5. creative
6.fixed
7..lively
8.. working
9.not having 10.ability 11. Yourself 12..good 13. to show 14. studying 15. Practical
B.根据汉语提示填入一个合适的单词，使句子完整正确：
1.general
2.standards
3.appeared
4. connected
5. extra
6.challenge
7.curious
8.impatient
9. suitable 10. praise 11. accountant 12. loyal 13. speech 14.absent
三、完形填空
ADACD BDBDD ACBAC
四、阅读理解
BCADC DBBDA BDBAC
五、任务型阅读
forgive health relationships deal Accept excuses right more forget peace 六、缺词填空
1
recommend polite/patient easily helpful ready extra others clever seem agree
2
born broken order strange seldom problem talk pass speech nothing
Unit1 基础过关 第一课时Section A(1a～2d) Ⅰ.根据句意及汉语提示填写单词。 1. Lily had a short ________(谈话)with her teacher. 2. Tom is just a child, so you should be ________(耐心的)with him. 3. Can you make a ________(句子)with “if”？ 4. Please read ________(大声地)so that I can hear you. 5. The two words look the same, but their ________(读音)are different. Ⅱ.用括号内所给单词的适当形式填空。 6. We study by ________(watch) English－language videos. 7. My brother wants to improve his ________(speak)skills. 8. It will ________(probable)rain. Please take your raincoat with you. 9. Bill，please take these English ________(textbook)to your teacher. 10. Can you finish ________(read)these books before 10 o'clock? Ⅲ.根据汉语意思完成句子，每空一词。 11. 他说话声音很低，太难听清楚他说什么了。 He speaks in a low voice. It's ________ ________ ________ hear him clearly. 12. 那位专家什么时候给我们作报告啊？ When will the expert ________ ________ ________ ________？ 13. 如果你逐字读，你需要三天才能读完那本书。 If you read ______ _______ ________，you need 3 days to finish reading the book. 14. 现在来做单词卡片怎么样？What about _____ ____ ______ now? 15. 房间越干净，你就会越感到舒服。 ________ ________ the room is，________ ________ ________ you'll feel. 第二课时Section A(3a～3b) Ⅰ.根据句意及汉语提示填写单词。 1. Do you know the most popular ________(表达)in 2015? 2. Could you tell me your ________(秘诀)for a long happy life? 3. Bob improves his English by doing ________(语法)exercises. 4. It is well known that Columbus ________(发现)America in 1492. 5. Mike doesn't know the ________(意思)of the new word. Can you tell him? Ⅱ.用方框中所给单词的适当形式填空。 6. The girl ________ Annie is my pen pal. 7. My teacher spoke so ________ that I couldn't follow her. 8. We really need your help and ________． 9. We sent him some flowers as an ________ of thanks. 10. He jumped about in excitement at the ________． Ⅲ.根据汉语意思完成句子，每空一词。 11. 对我来说这是小菜一碟。It's _____ _____ ________ ________ for me. 12. 我第一次来到上海就爱上了这个城市。 I ________ ________ ________ ________ Shanghai when I first come here. 13. 不要害怕寻求帮助。Do not ________ ________ ________ ask for help. 14. 当我给汤姆打电话的时候，他正在用字典查新单词。 When I called Tom，he was ________ ________ new words in the dictionary. 15. 这家商店也卖各种各样的衣服。The shop sells all kinds of clothes ____ ______． 第三课时Section A(4a~4c) Ⅰ.用方框中所给单词的适当形式填空。 1. Learning grammar helps me understand the sentence ________ better. 2. Alice is my pen ________．She comes from England. 3. She remembered the long article by ________ it over and over again. 4. I'm good at physics and ________．I often get good scores in them. 5. He studied his map，trying to ________ the way to Ann's street. Ⅲ.根据汉语提示完成句子，每空一词。 11. It's a good habit to ________ ________(记笔记)in class. 12. When did you begin to ________ ________ ________(记日记)，Mike? 13. Listen carefully to every word you hear，then ________ ________ ________ ________(大声把它们重复出来)． 14. Yang Juan always ______ ________ ________(和……谈话)her friends in English. 15. Wang Lin often listens to the tapes to ____ ________ ________(改善他的发音)． 第四课时Section B(1a～1e) Ⅰ.根据句意及汉语提示填写单词。 1. My foreign friend thinks China's population ________(增加)quickly in the past. 2. The train is travelling at a ________(速度)of sixty miles an hour. 3. Mary will be my ________(搭档)in the next dance. 4. Jessica is from England. So she doesn't ________(理解)Chinese. 5. Why do you make so many ________(错误)?
第三单元第15课古代诗歌四首 一、名句默写 1.树木丛生,。,洪波涌起。 2.日月之行,若出其中;,。 3.,风正一帆悬。 4.乡书何处达?。 5.乱花渐欲迷人眼,。 6.,绿杨阴里白沙堤。 7.枯藤老树昏鸦,,古道西风瘦马。 8.夕阳西下,。 9.王湾在《次北固山下》一诗中,表现时序的交替,蕴含自然理趣的句子是:,。 10.《观沧海》中诗人以奇特的想象,表现大海博大无比的诗句是:,;,。 11.(2018·邵通中考)“诗魔”白居易在《钱塘湖春行》中,用“,”描写莺燕报春的勃勃生机。 12.( 2018·遵义中考)《天净沙秋思》中表现天涯游子漂泊无依的愁苦之情的句子是:,。 二、诗词鉴赏 13.(2018·娄底中考)阅读下面一首诗,回答问题。 次北固山下
王湾 客路青山外,行舟绿水前。 潮平两岸阔,风正一帆悬。 海日生残夜,江春入旧年。 乡书何处达?归雁洛阳边。 (1)这首诗表现了诗人怎样的思想感情? 答: (2)“海日生残夜,江春入旧年”一联历来脍炙人口,“生”和“入”用得很妙,请说说妙在何处。 答: 14.(2018·来宾中考)阅读下面这首诗,然后回答问题。 观沧海 曹操 东临碣石,以观沧海。 水何澹澹,山岛竦峙。 树木丛生,百草丰茂。 秋风萧瑟,洪波涌起。 日月之行,若出其中; 星汉灿烂,若出其里。 幸甚至哉,歌以咏志。 (1)诗中画线句描绘了大海怎样的景象?有何用意?
答: (2)请简要分析这首诗的主要写作特色。(写出两点即可) 答:
答案解析 1.答案:百草丰茂秋风萧瑟 2.答案:星汉灿烂若出其里 3.答案:潮平两岸阔 4.答案:归雁洛阳边 5.答案:浅草才能没马蹄 6.答案:最爱湖东行不足 7.答案:小桥流水人家 8.答案:断肠人在天涯 9.答案:海日生残夜江春入旧年 10.答案:日月之行若出其中星汉灿烂若出其里 11.答案:几处早莺争暖树谁家新燕啄春泥 12.答案:夕阳西下断肠人在天涯 13.答案:(1)乡愁乡思之情。(“思乡之情”“乡愁”亦可) (2)“生”“入”采用拟人手法,将“日”和“春”人格化,赋予它们人的意志和情思,无意说理,却在描写景物节令中蕴含哲理。 14.(1)答案:描绘了大海宏伟的气势,或辽阔无边,或壮观景象,表达了作者博大的胸襟和远大的政治抱负。(大意对即可) (2)【解析】此题考查对写作特色的把握。可以从修辞手法、抒情方式、景物描写等方面思考。 答案:①情景交融:借大海的宏伟广阔抒发自己建功立业的远大抱负。 ②虚实结合:写景为实,想象为虚。③动静结合:水的动,岛的静;树木百
万有引力定律课时练习 班级 姓名 得分 例题推荐 1．下列关于万有引力的说法中，错误的是 ( ) A ．地面上自由下落的物体和天空中运行的月亮，受到的都是地球引力 B ．万有引力定律是牛顿在总结前人研究的基础上发现的 C ．F=Gm 1m 2／r 2 中的G 是比例常数，适用于任何两个物体之间，它没有单位 D ．万有引力定律适用于自然界中任意两个物体之间 2．地球对表面物体的万有引力与物体受到的重力大小近似相等，若已知地球的质量M 、地球的半径R 和引力常量G ，试求出重力加速度g ． 练习巩固 3．关于万有引力定律的适用范围，下列说法中正确的是 ( ) A ．只适用于天体，不适用于地面物体 B ．只适用于球形物体，不适用于其他形状的物体 C ．只适用于质点，不适用于实际物体 D ．适用于自然界中任意两个物体之间 4．在万有引力定律的公式2 2 1r m Gm F = 中，r 是 ( ) A ．对星球之间而言，是指运行轨道的平均半径 B ．对地球表面的物体与地球而言，是指物体距离地面的高度 C ．对两个均匀球而言，是指两个球心间的距离 D ．对人造地球卫星而言，是指卫星到地球表面的高度 5．如图6—2—1所示，r 虽大于两球的半径，但两球的半径不能忽略，而球的质量分 布均匀，大小分别为m 1与m 2，则两球间万有引力的大小为 ( ) A ． 22 1r m Gm B ．2 121r m Gm C ． 22121)(r r m Gm + D ．2 212 1)(r r r m Gm ++ 6．假设地球为一密度均匀的球体，若保持其密度不变，而将半径缩小1/2。那么地面上的物体所 受的重力将变为原来的 ( ) A ．2倍 B ．1／2 C ．4倍 D ．1／8 7．如果认为行星围绕太阳做匀速圆周运动，那么下列说法中正确的是 ( ) A ．行星受到太阳的万有引力，万有引力提供行星圆周运动的向心力 B ．行星受到太阳的万有引力，行星运动不需要向心力
七年级下册语文课时特训参考答案 第一单元人物风采 一、童年的朋友 一、xī liǔ chéng zhòu 疏耀鬃熄 二、diào tiáo pú fǔ 皱绉辫辩三、1.表现外祖母对密而长的头发现出烦恼和不满 2.写出外祖母开朗的性格和年轻明朗的心态 3.揭 示出外祖母乐观坚毅的个性 四、 1.动作描写。表现外祖母头发的浓密，写出了她身体的健康。 2.语言描写。既写出来外祖母对我的关爱，也写出了他和我之间朋友式 的关系。 五、 1.我童年的朋友是我的外祖母。是因为他不但像一般的长辈那样关爱我，而且和我有着一种特殊的友情。他能像朋友一样尊重我，平 等的对待我，他对世界无私的爱丰富了我的精神世界，她的乐观坚毅 是我充满了坚强的力量以应付困苦的生活。 2.用抒情式的议论表达我对外祖母的感激，写出了外祖母对我一生的重大影响和意义。 六、 1.首先写外祖母的笑，接着写她的 眼睛，最后写她可爱而又可笑的举动。 2.外祖母是一个饱经生活艰难而却永远年轻乐观的老人。 3.将外祖母的语音比作鲜花。比喻恰当而又新奇，生动的表现了外祖母对我的深 刻影响和我对她的爱。 4.驼背而肥胖但轻快而敏捷。反映外祖母承担着繁重的劳动和艰辛的生活。 5.叠字：牢牢字字句句圆圆肥肥胖胖。作用：深化了语言的意境。 七、示例：高尔基（1886-1936）苏联无产阶级作家，社会主义现实 主义文学的奠基人。他出身贫苦自幼丧父，11岁即为生计在社会上奔波，当过装卸工，面包房工人，贫民窟和码头成了他“社会”大学课
堂。代表作有自传体长篇小说《童年》《在人间》《我的大学》和长篇小说《母亲》等。 八、略 九、如桃花潭水深千尺不及汪伦送我情。劝君更尽一杯酒西出阳关无故人。 十、1.照彻了我灵魂的黑暗，使我的生存有一点光彩。 2.作者认为没有朋友，他将不能够生活到现在。第二问示例：持否定态度。在生活中，家庭和朋友是和谐统一的关系，而不是对立的关系。亲情友情会使家庭生活更加充实。 3.多量的同情，多量的爱，多量的欢乐，多量的眼泪。 4.朋友给我的关爱是我过去生活的物质基础和精神支柱；我要将这些化作精神动力，满怀信心的去开创新生活 5.略 6.（言之有理即可）如：“人不为己天诛地灭”，虽然写出了人自私的一面，但难免太过绝对，还会鼓励人们都将个人的利益放在首位。而“常常显露出大量的慷慨”且又不需要报答，也要看被协助的对象的具体情况而定。
新概念青少版入门级(B) Unit 1 单元练习题日期英文名家长签字 一、单词( words ) 爷爷，外公，祖父，外祖父 奶奶，外婆，祖母，外祖母 妈妈爸爸 伯母，婶婶；姑姑，阿姨，舅妈 伯父，叔叔；姑父，姨夫，舅舅 堂（表）兄弟姐妹 姐妹兄弟 这，这个那，那个 是 男孩女孩 男人女人 瘦的胖的 高的小的 二、知识点( knowledge points ) 1、，是代词。指时间或空间上较近的人及事物。 2、，是代词。指时间或空间上较远的人及事物。 3、区别成人的性别用和。 4、区分小孩子的性别用和。 5、用来提问“人”，用来提问“物”。
6、在回答“this”和“that”作主语的疑问句时，常用“”代替“this”和“that”比如： ——Is this/ that a car? 这/那是一辆小汽车吗？ ——Yes, is. / No, isn’t. 是的，它是。/ 不，它不是。 ——Who’s this/ that? 这/那是谁？is grandfather. 这/那是爷爷。 ——What’s this/that? 这/那是什么？Is a ruler.这/那是一把尺子。 7、缩写(abbreviations) that is= who is= it is= what is = she is= he is= it is not= 三、句型(sentences)（请把下面的汉语句子翻译成英语） 1、那是你的妈妈吗？ ——是的，那是。 ——不，那不是。 2、那是我的爸爸。这是李明。 3、这是谁？ 4、这是一本书吗？ 5、那是一支钢笔吗？ 6、那是谁？它是Kim。 7、那个女孩是谁？她是Jenny。 8、那个男孩是谁？他是Jerry。 9、这个女人是谁？她是Amy。 10、这个男人是谁？他是Kay。
课时达标训练(二)细胞中的元素和无机化合物 (时间：30分钟；满分：50分) 一、选择题(每小题3分，共30分) 1．下列关于组成生物体化学元素的叙述不正确的是() A．Ca、Mg属于大量元素，Fe、Zn属于微量元素 B．生物体内的任何一种元素都可以在无机自然界中找到 C．不同生物组成元素的种类差别很大，而含量基本相同 D．O是活细胞中含量最多的元素 2．(2015·延边汪清中学高一期中)当生物体新陈代谢旺盛、生长迅速时，生物体内() A．结合水与自由水的比值与此无关 B．结合水与自由水的比值会降低 C．结合水与自由水的比值会升高 D．结合水与自由水的比值不变 3．世界卫生组织已将骨质疏松症确定为是继心血管疾病之后的第二个威胁人类健康的主要疾病，其致病原因主要是钙流失和钙吸收能力下降。下列说法错误的是() A．无机盐离子对于维持生物体的生命活动有重要作用 B．生物体内的无机盐离子必须保持一定的比例 C．生物体内的钙都以碳酸钙的形式存在 D．血液中的钙含量过低会导致肌肉抽搐 4．(上海高考改编)生长在含盐量高、干旱土壤中的盐生植物，通过在细胞中贮存大量的Na＋而促进细胞吸收水分，该现象说明细胞中Na＋参与() A．调节渗透压B．组成体内化合物 C．维持正常pH D．提供能量 5．下列关于细胞中含水量的说法，正确的是() A．同一环境中不同种生物细胞中含水量一般相等 B．同一生物体中，不同组织细胞中含水量基本相同 C．萌发的种子中的含水量高于休眠种子中的含水量 D．同一生物体在不同的生长发育期含水量基本无差异 6．结合下列曲线，判断有关无机物在生物体内含量的说法，错误的是() A．曲线①可表示人一生中体内自由水与结合水的比值随年龄的变化 B．曲线②可以表示细胞呼吸速率随自由水与结合水比值的变化 C．曲线③可以表示一粒新鲜的玉米种子在烘箱中被烘干的过程中，其内无机盐的相对含量变化 D．曲线①可以表示人从幼年到成年体内水含量的变化 7．2014年3月22日是第22个“世界水日”，宣传的主题是“水与能源”。水污染、水资源短缺导致的水危机日趋严重，研究表明，80%的疾病是由水污染引起的。下列有关生物体内水的叙述，错误的是() A．水在病变细胞中以结合水和自由水的形式存在 B．生物体不同的生长发育阶段水的含量不同 C．人体衰老细胞中自由水含量减少，代谢缓慢 D．冬季，植物体内自由水含量相对增高，以增强植物的抗寒能力 8．关于无机盐在生物体中功能的叙述错误的是() A．镁是叶绿体中参与光合作用的各种色素的组成元素 B．人体缺铁会影响正常的有氧呼吸功能
年月日练习题及答案 一、填空。 1．一年有（12 ）个月，31天的月份有（1月，3月、5月、7月、8月、10月、12 月），30天的月份有（4月，6月、9月、11月），平年的二月有（ 28 ）天，闰年的二月有（29 ）天。 2．今年的二月份有（28 ）天，全年共有（ 365 ）天，是（平）年。 3．乐乐是1996年7月12日出生的，到今年生日时，他满（18 ）周岁。 ４.小青的生日在第三季度里的小月，而且是这个月的倒数第八天，小青的生日是（9）月（23 ）日：小平的生日比小青的生日早10天，小平的生日是（ 9 ）月（ 13 ）日。 5．火车12：35分出发，下午4：00到达，中间经过了（ 3 ）时（25）分。 辅导：4时—35分=3时25分 6．闰年全年有（366 ）天，是（52 ）个星期零（2 ）天。辅导：1.熟背 2. 366除以7=52周……2天 7．8月1日的前一天是（7）月（31）日，6月30日的后一天是（7）月（1）日。 8．36个月＝（3）年48时＝（ 2 ）日 5星期＝（35 ）天半年＝（ 6 ）个月
49天＝（7 ）星期18个月＝（1）年（ 6 ）个月 二．选择． １．下列年份中不是闰年的是（Ｃ）． Ａ．2000年Ｂ．2008年Ｃ．1902年Ｄ．2004年２．一部电影从下午４时２５分开始播放，共播放１时３０分，（Ｂ）结束． Ａ．５时５５分Ｂ，１７时５５分 Ｃ．下午５时５０分Ｄ．１７时５０分 ３．叔叔要乘Ｔ６０次火车从上海去广州，火车发车时间为２１时３５分，叔叔从家到车站要用４０分钟，发车前５分钟停止检票，叔叔最晚（Ａ）出发才不会误了火车． Ａ．晚上８时５０分Ｂ．晚上１０时５５分 Ｃ．２１时５０分Ｄ．２１时５５分 ４．小华的生日是第二季度最后一个月，日子数比月份多７，小华的生日是（Ｃ）． Ａ．４月１３日Ｂ．４月１１日Ｃ．６月１３日Ｄ．５月１２日
人教版小学六年级语文下册训练 1文言文两则 【字词荟萃】 1、形近字组词。 弈（）俱（）援（）盂（） 奕（）惧（）缓（）孟（） 2、按要求写四字词语。 （1）意思与“专心致志”相近的四字词语： （）（）（） （2）仿照“沧沧凉凉”写叠词： （）（）（） 3、选字填空。 诲悔 （1）我会牢记老师的教（）的。 （2）对以前的事，他感到很后（）。 至致 （3）他离开后（）今还没有来信。 （4）由于他粗心大意，（）使公司损失一百万。 【句段集锦】 解释带点字的意思，并翻译句子。 （1）弈秋，通国之善弈者也。 ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ （2）为是其智弗若与？ ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿__＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ （3）我以日始出时去人近，而日中时远也。 ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ ＿＿＿＿_____________________________________＿＿＿＿＿＿＿＿＿＿＿_ （4）孰为汝多知乎？ ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ 【课文链接】 1、阅读《学弈》后，回答下面的问题。 （1）写出“之”在句子中的意思。 ①一人虽听之，一心以为有鸿鹄将至，思援弓缴而射之。（）（） ②虽与之俱学，弗若之矣。（）（） （2）课文记叙了两个人跟弈秋学下围棋，一个________________________，一个__________________________，告诉我们_____________________________。 2、阅读《两小儿辩日》后，回答下面的问题。 （1）找出文中的3对反义词，写下来。 ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ （2）抄写文中的一个比喻句，并写出这个句子把什么比作什么。
Unit1 单元练习 一．语音知识：从A、B、C、D四个选项中，找出划线部分与所给单词划线部分读音相同的选项。 1. room A. bedroom B. good C. football D. school 2. come A. welcome B. love C. handsome D. hot 3. Saturday A. glad B. want C. make D. later 4. large A. popular B. warm C. hard D. quarter 5. great A. seat B. meat C. break D. speak 二．词汇与语法知识：从A、B、C、D四个选项中，选择出可以填入空白处的最佳答案。 6. Hello,John! Welcome ____ Shijiazhuang. A. at B. to C. in D. / 7. I?ll be glad _________ with you. A. to go B. going C. go D. gone 8. My house is ____ the fifth floor. A. in B. at C. into D. on 9. I like playing _ football, so my father bought _ football for me. A. a; the B. an; the C. /; / D. /; a 10. There are ___ students on the playground. A. a lot B. a lots of C. a lot of D. lot of 11. He does morning exercises ______. A. everyday B. every day C. someday D. some day 12. _____ beautiful the garden is! A. What B. How C. What a D. How a 13. _____ beautiful garden it is! A. What B. How C. What a D. How a 14. Thank you very much _____ your help. A. to B. as C. for D. because 15. Our classroom building is ______ the dinning-hall. A. next to B. next on C. at D. to 16. There are sixty classrooms and many _____ rooms in this building. A. teacher B. teachers C. teacher?s D. teachers? 17. As a student, we must study _______. A. hard B. hardly C. harder D. hardest 18. She usually lets the child _____ the kind of funny things. A. do B. does C. to do D. doing 19. Can you show me the way ____ the railway station? A. of B. at C. on D. to 20. There _____ a dinning room and two bedrooms in my house. A. be B. is C. are D. has 21. There _____ three students and a professor in the room. A. be B. is C. are D. have 22. _____ your father a doctor?
课时达标训练（十五） 一、选择题 1．(山东高考)函数f (x )＝ 1－2x ＋1x ＋3的定义域为 ( ) A ．(－3,0] B ．(－3,1] C ．(－∞，－3)∪(－3,0] D ．(－∞，－3)∪(－3,1] 2．指数函数y ＝b ·a x 在[b,2]上的最大值与最小值的和为6，则a ＝( ) A ．2 B ．－3 C ．2或－3 D.12 3．已知f (x )＝????? f (x －2)，x ≥0，2x ，x ＜0，则f (8)等于( ) A ．4 B ．0 C.14 D ．2 4．定义运算a ×b ＝????? a (a ≤ b )，b (a ＞b )，则函数f (x )＝1×2x 的图像是( ) 二、填空题 5．函数y ＝8－2x 的定义域是 ________． 6．已知a ＝0.30.2，b ＝0.20.2，c ＝0.20.3，d ＝????12－1.5，则a ，b ，c ，d 由小到大排列的顺 序是________． 7．函数f (x )＝????? －x ＋3－3a ，x ＜0，a x ，x ≥0(a ＞0，a ≠1)是(－∞，＋∞)上的减函数，则a 的取值范围是________． 答案：??? ?0，23 8．若0＜a ＜1，b ＜－1，则函数f (x )＝a x ＋b 的图像一定不经过第________象限． 三、解答题 9．已知函数y ＝a 2x ＋2a x －1(0＜a ＜1)在区间[－1,1]上的最大值是14，试求a 的值．
10．已知函数f (x )＝??? ?12x －1＋12·x 3. (1)求f (x )的定义域； (2)讨论f (x )的奇偶性； (3)证明f (x )＞0. 答案 1．解析：选A 由题意得????? 1－2x ≥0，x ＋3>0，所以－3 参考答案 模块一参考答案； 一、填空题；1、集成、芯片上、计算机。2、CPU、存储器、定时器、输入/ 输出 二、单项选择题1、（B ）2、（ C ）三、判断题1、（×）2、（√）四、计算题1、（01010010）B 2、52H 2、（59227 ）10 ( 163533 )8 (E75B )16 模块二参考答案 一、填空题： 1、当MCS-51引脚ALE有效时，表示从P0口稳定地送出了低8位地址。 2、MCS-51的堆栈是软件填写堆栈指针临时在片内数据存储器内开辟的区域。 3、MCS-51有4组工作寄存器，它们的地址范围00H~1FH 。 4、PSW中RS1 RS0=10时，R2的地址为12H 。 二、选择题： 1、当MCS-51复位时，下面说法正确的是（ A ）。 A、PC=0000H B、SP=00H C、SBUF=00H D、P0=00H 2、PSW=18H时，则当前工作寄存器是（ D ）。 A、0组 B、1组 C、2组 D、3组 3、MCS-51上电复位后，SP的内容应是（ B ）。 A、00H B、07H C、60H D、70H 4、单片机上电后或复位后，工作寄存器R0是在（ A ）。 A、0区00H单元 B、0区01H单元 C、0区09H单元 D、SFR 三、判断题 1、当MCS-51上电复位时，堆栈指针SP=00H。（×）——SP=07H 2、PC存放的是当前正在执行的指令。（×）——是将要执行的下一条指令的地址 3、8051的累加器ACC是一个8位的寄存器，简称为A，用来存一个操作数或中间结果。（√） 4、8051的程序状态字寄存器PSW是一个8位的专用寄存器，用于存程序运行中的各种状态信息。（√） 5、MCS-51的特殊功能寄存器分布在60H~80H地址范围内。（×）——80H~FFH 四、简答题 1、80C51 ROM空间中，0000H~0023H有什么用途？用户应怎样合理安排？ 答：0000H~0023H是80C51系统专用单元，其中0000H为CPU复位地址，0003H~0023H 是5个中断源中断服务程序入口地址，用户不能安排其他内容。一般来讲，从0030H以后，用户可自由安排。 2、简述读外ROM和读写外RAM用到的控制信号。 答：读外ROM的控制线有3条： 类文阅读-22我们奇妙的世界 长河落日扁 落日为什么是扁的呢？这是光的折．（zhé shé）射现象在捣鬼。 不少人都有这样的经验：把筷子插入一只盛水的杯子里，看起来筷子是折．（zhé shé）成两段的。这就是光的折射现象。 在空气中光线会不会曲折呢？也会。为什么呢？由于地心引力的关系，接近地球表面的地方大气浓厚，越往高处空气越稀薄．（bó báo）。这种差别并不大，所以我们通常觉察不到光线由此产生的曲折。但是，太阳落山时，阳光斜着通过大气，距离很远，产生的折射已经可以使人明显地感觉到。这种折射越贴近地面越强。落日的上端和下端光线曲折得不一样，看起来就成扁的了。 光的折射现象给人们带来的好处倒是实实在在的。三四百年来，利用这种现象设计制造的显微镜、望远镜等光学仪器，使人们看到了秋毫之微末、天体之宏大，大大地扩展了我们的眼界，为发展人类文明做出了很大的贡献。 看来，天天见到的落日之中还有一些道理呢！ 1.给文中加点字选择正确读音,用“√”画出。 2.根据短文内容填空。 本文提到的两种现象分别是和，都是光的造成的。 3.通常说“长河落日圆”，可在本文中为什么说落日是扁的？用“”在文中标出。 4.光的折射现象对人类有哪些帮助？ 5.读短文最后一句话，你有哪些感受或想法？ 1.画：zhé shé bó 2.插入水中的筷子变折了看到的落日是扁的折射 3. 画：由于地心引力的关系，接近地球表面的地方大气浓厚，越往高处空气越稀薄。这种差别并不大，所以我们通常觉察不到光线由此产生的曲折。但是，太阳落山时，阳光斜着通过大气，距离很远，产生的折射已经可以使人明显地感觉到。这种折射越贴近地面越强。落日的上端和下端光线曲折得不一样，看起来就成扁的了。 4.人们利用光的折射现象设计制造了显微镜、望远镜等光学仪器，使人们看到了秋毫之微末、天体之宏大，大大地扩展了人们的眼界。 5.例：大自然中到处都有奥秘，需要我们用心观察，认真思考才能发现。 大自然畅想曲 大自然像一首首美丽的小诗，像一篇篇五彩的童话。 “蓝天白云飘，太阳微微笑，野花点点头，景色多美好……”孩子们在练习唱《春光好》。杨柳听了，得意地照了照“镜子”，梳理一下那动人的秀发，向小草、小花展示它婀娜多姿的身材。 “知了，知了……”蝉在枝头兴奋地展示着她那美丽的歌喉。小蝌蚪找到了妈妈，同时，也被让妈妈流连忘返的地方迷住了——清澈见底的小河上漂浮着一朵朵荷花，在微风的吹拂下翩翩起舞，好像要告诉人们，它们是世界上最好的舞蹈家。 八年级下第一单元基础练习（30分钟） 1. Everyone ________ here but no one ________ her. A. is; knows B. are; know C. is; know D. are; knows 2. It ________ him thirty minutes to finish his homework. A. took B. cost C. spent D. used 3. It is important ________ us to learn English well. A. with B. to C. of D. for 4. My uncle went to London and ________ there for a few days last month. A. lived B. lives C. stays D. stayed 5. I predict he will be an engineer _______ten years because he is so interested in making things. A. in B. after C. later D. for 6. This year I think I will have ______ friends and spend _______ time in playing computer games. A. more, less B. less, more C. fewer; fewer D. more, fewer 7. I hear that the small river is very dirty, and _______ people go to swim in it. A. few B. a few C. little D. a little 8. Look! There are some children ________ games on the playground. A. play B. playing C. to play D. are playing 9. If I am an astronaut in the future, I’ll ________ to the moon._____ a rocket. A. can fly, by B. be able to fly, in C. to fly, on D. flying, by 10. Would you like to have a try now? ---- Sure. It _______ both interesting and exciting. A. seems B. is looking C. is like D. sound 11. Do you know _________ in 300 years? A. what man will look like B. how man will look like C. what will man look like D. how will man look like 12. Mum, could you buy me a dress like this? --- Certainly, we can buy _____than this, but _______this. A. a better, better than B. a worse, as good as C. a cheaper, as good as D. a more important, not as good as 13. How many people __________there fifty years ago. A. will B. were C. are D. will be X|k | B| 1 . c|O |m 14. I ________rockets to the moon when I grow up. A. take B. will fly C. took D. will be fly 15. It will take ________ years to make robots ________ the most unpleasant things. A. hundred , do B. hundreds of , to do C. two hundreds , do D. hundreds of , do 16. This coat doesn't fit him well, as he has _________ a huge body and the coat is _________ small. A. so; such B. so; so C. such; such D. such; so 17. Here’s_______ ink in my pen. Could you give me some? A. few B. a few C. little D. a little 18. My friends ________ a pet pig in their house. A. keeps B. feeds C. keep D. look 19. Could you pass me two __________? A. pieces of paper B. pieces of papers C. pieces paper D. piece papers 20. Our teacher tried ________ the players ________ well in the match. A. make; play B. to make; to play C. to make; play D. make; to play 1. When she was 20,her dream to be a singer___________________(实现). 2. We should remember the words ______ and ________________(反复地). 3. In fact, in some cities, the air p_________ is quite serious(严重的). What’s your opinion, Mary? 4. Her mother ________(可能) go to Australia. 5. I ________________________________(爱上了) the big city of Shanghai as soon as I got there last year. 课时达标训练 1.(2013·泰州高一检测)下列化学用语正确的是( ) 的电子式H+]2-H+ B.次氯酸的结构式：H—Cl—O 的结构式N≡ D.质子数为53、中子数为72的碘原子I 2.(2014·宿迁高一检测)下列叙述错误的是( ) A.带相反电荷的离子之间的相互吸引力称为离子键 B.金属元素与非金属元素化合时,不一定形成离子键 C.只有阴、阳离子间才能形成离子键 D.非金属元素也可能形成离子键 3.(双选)下列关于物质与化学键的关系正确的是( ) A.离子化合物可能含共价键,共价化合物中不含离子键 B.共价化合物可能含离子键,离子化合物中只含离子键 C.构成单质分子的微粒一定含有共价键 D.在氧化钠中,除氧离子和钠离子的静电吸引作用外,还存在电子与电子、原子核与原子核之间的排斥作用 4.某元素的原子最外层只有一个电子,它与卤素结合时,所形成的化学键是 ( ) A.一定是离子键 B.一定是共价键 C.可能是离子键,也可能是共价键 D.使两原子都达到8电子稳定结构 5.(2014·聊城高一检测)下列分子的电子式书写正确的是( ) A.氨气：H B.四氯化碳：Cl C.氮气 D.二氧化碳 6.下列用电子式表示的化合物的形成过程正确的是( ) 7.(2014·新乡高一检测)下列物质中,含共价键的离子化合物是( ) 2 是常见的绿色氧化剂,其分子结构示意图如图所示,下列有关其说法不正确的是( ) 中含有离子键 中存在极性共价键 中存在非极性共价键 D.液态H2O2分子间存在氢键 9.(2014·济宁高一检测)标号为①～⑩的元素,在元素周期表中的位置如下： 试回答下列问题： (1)其原子只要形成一对共用电子对就达到了稳定结构的元素是。(填写元素符号) (2)①和④号元素形成的化合物的化学式为,用电子式表示其形成过程为。 (3)⑧号元素的最高价氧化物对应的水化物的化学式是。 (4)①、⑤、⑦号元素形成的一种化合物的电子式是,在该化合物中既含有键,又含有键。 10.(2014·无锡高一检测)有下列7种物质：A.干冰、B.氧化镁、C.氯化铵、 D.固态碘、 E.碱、 F.冰、 G.过氧化钾 (1)熔化时需要破坏共价键和离子键的是(填序号,下同); (2)熔点最低的是; (3)既有离子键又有共价键的是;基础训练参考答案
部编版三年级语文下册课时训练-我们奇妙的世界(含答案)
人教版八年级英语下册第一单元基础练习题(附答案)
课时达标训练1.3
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