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新起点大学英语精读教程第一册课后习题部分答案(整理)

新起点大学英语精读教程第一册课后习题部分答案(整理)
新起点大学英语精读教程第一册课后习题部分答案(整理)

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第三版新视野大学英语读写教程1unit1-unit6答案全

第三版新视野大学英语读写教程1unit1-unit6答案全

Book One Unit One 10.Translate the following paragraph into Chinese. Socrates was a classical Greek philosopher who is credited with laying the fundamentals (基础) of modern Western philosophy. He is a mysterious figure known chiefly through the accounts of later classical writers, especially the writings of his most famous student Plato, Socrates has become well known for his contribution to the field of ethics. His method of teaching, known as the Socratic Method, by asking and answering questions to stimulate critical thinking and to explain ideas remains a commonly used tool in a wide range of discussions. He also made important and lasting contributions to the field of epistemology(认识论) and logic,and the influence of his ideas and approach remains a strong foundation for Western philosophy that followed. Socrates was the most colorful figure in the history of ancient philosophy. His fame was widespread in his own time, and his name soon became a household word although he constructed no philosophical system, established no school, and founded no sect(宗派). 译文: 苏格拉底是古希腊哲学家,被誉为现代西方哲学的奠基人。

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1.3 一个物体能否被看作质点,你认为主要由以下三个因素中哪个因素决定: (1) 物体的大小和形状; (2) 物体的内部结构; (3) 所研究问题的性质。 解:只有当物体的尺寸远小于其运动范围时才可忽略其大小的影响,因此主要由所研究问题的性质决定。 1.4 下面几个质点运动学方程,哪个是匀变速直线运动? (1)x=4t-3;(2)x=-4t 3+3t 2+6;(3)x=-2t 2+8t+4;(4)x=2/t 2-4/t 。 给出这个匀变速直线运动在t=3s 时的速度和加速度,并说明该时刻运动是加速的还是减速的。(x 单位为m ,t 单位为s ) 解:匀变速直线运动即加速度为不等于零的常数时的运动。加速度又是位移对时间的两阶导数。于是可得(3)为匀变速直线运动。 其速度和加速度表达式分别为 2 2484 dx v t dt d x a dt t=3s 时的速度和加速度分别为v =20m/s ,a =4m/s 2。因加速度为正所以是加速的。 1.5 在以下几种运动中,质点的切向加速度、法向加速度以及加速度哪些为零哪些不为零? (1) 匀速直线运动;(2) 匀速曲线运动;(3) 变速直线运动;(4) 变速曲线运动。 解:(1) 质点作匀速直线运动时,其切向加速度、法向加速度及加速度均为零; (2) 质点作匀速曲线运动时,其切向加速度为零,法向加速度和加速度均不为零; (3) 质点作变速直线运动时,其法向加速度为零,切向加速度和加速度均不为零; (4) 质点作变速曲线运动时,其切向加速度、法向加速度及加速度均不为零。 1.6 |r |与r 有无不同?t d d r 和d d r t 有无不同? t d d v 和t d d v 有无不同?其不同在哪里?试举例说明. 解:(1)r 是位移的模, r 是位矢的模的增量,即r 12r r ,12r r r ; (2) t d d r 是速度的模,即t d d r v t s d d . t r d d 只是速度在径向上的分量. ∵有r r ?r (式中r ?叫做单位矢),则 t ?r ?t r t d d d d d d r r r 式中 t r d d 就是速度在径向上的分量,

(第三版)新视野大学英语读写教程1答案

(第三版)新视野大学英语读写教程1答案

Unite 1 1.选词填空 explore(v.勘探,探测) transmit(v.传送,传递,传播) resource(n.资源) emerge(v.出现,为···所公认) yield(v.产生,出产,屈从,让步) pose(v.摆姿势,导致) assume(v.认为,假定,假设) confidence(n.信任信赖,自信心) inherit(v.沿袭,秉承,继承) comprehensive(a.综合的,多方面的) 1. Given the chance to show his ability, he regained confidence and began to succeed in school. 2. It is so difficult to explore the bottom of the ocean because some parts are very deep. 3. It was about 30 seconds before Alex emerged from the water; we were quite scared. 4. We often assume that when other people do the same things as we do, they do them for the same reasons; but this assumption is not always reasonable. 5. There is widespread concern that the rising unemployment may pose a threat to social stability. 6. After a(n) comprehensive physical exam, my doctor said I was in good condition except that my blood pressure was a little high. 7. It is well known that China is a country with rich natural resources and a very big population. 8. Some people believe that the earth can yield enough food to support at least twice its present population. 9. Sam inherited the gift of imagination from his family, but he lacked the driving power to take action. 10. A bee that has found honey is able to transmit to other bees the information they need in order to collect the honey. 2.15选10 attain赢得,获得,得到 fascinating迷人的,吸引人fulfill履行,执行pursue追求,致力于 available可获得的可利用的 qualify使合适,合格raise提升,增加 passion强烈的爱好,热爱 virtually实际上classify分类归类 acquire获得,取得,学到 fashionable流行的especially特别的 sample样品,标本 prosperous繁荣的University students come from different parts of the country with various purposes. However, a closer look at their reasons for studying at the university will enable us to (1)classify them roughly into three groups: those who have a(n) (2)passion for learning, those who wish to (3)attain a bright future, and those who learn with no definite purpose. Firstly, there are many students who learn simply because they (4)pursue their goal of learning. Some read a wealth of British and American novels because they are keenly interested in literature. Others sit in front

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