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雅思写作经典范文10篇 (四)

雅思写作经典范文10篇 (四)
雅思写作经典范文10篇 (四)

雅思写作经典范文 10 篇(五)

31 British Columbia

British Columbia is the third largest Canadian provinces, both in area and population. It is

nearly 1.5 times as large as Texas, and extends 800 miles (1,280km) north from the

United States border. It includes Canada’s entire west coast and the islands just off the

coast.

Most of British Columbia is mountainous, with long rugged ranges running north and south.

Even the coastal islands are the remains ofa mountain range that existed thousands of

years ago. During the last Ice Age, this range was scoured by glaciers until most of it was

beneath the sea. Its peaks now show as islands scattered along the coast.

The southwestern coastal region has a humid mild marine climate. Sea winds that blow

inland from the west are warmed by a current of warm water that

flows through the Pacific

Ocean. As a result, winter temperatures average above freezing and summers are mild.

These warm western winds also carry moisture from the ocean. Inland from the coast, the winds from the Pacific meet the mountain barriers of the coastal

ranges and the Rocky Mountains. As they riseto cross the mountains, the winds are

cooled, and their moisture begins to fall as rain. On some of the western slopes almost

200 inches (500cm) of rain fall each year.

More than half of British Columbia is heavily forested. On mountain slopes that receive

plentiful rainfall, huge Douglas firs rise in towering columns. These forest giants often

grow to be as much as 300 feet (90m) tall, with diameters up to 10 feet (3m). More lumber

is produced from these trees than from any other kind of tree in North America. Hemlock,

red cedar, and balsam fir are among the other trees found in British Columbia.

32 Botany

Botany, the study of plants, occupies a peculiar position in the history of human

knowledge. For many thousands of years itwas the one field of awareness about which

humans had anything more than the vaguest of insights. It is impossible to know today just

what our Stone Age ancestors knew about plants,but form what we can observe of pre-

industrial societies that still exist a detailed learning of plants and their properties must be

extremely ancient. This is logical. Plants are the basis of the food pyramid for all living

things even for other plants. They have always been enormously important to the welfare

of people not only for food, but also for clothing, weapons, tools, dyes, medicines, shelter,

and a great many other purposes. Tribes living today in the jungles of the Amazon

recognize literally hundreds ofplants and know many properties of each. To them, botany,

as such, has no name and is probably not even recognized as a special branch of

“knowledge” at all.

Unfortunately, the more industrialized we become the farther away we move from direct

contact with plants, and the less distinct our knowledge of botany grows. Yet everyone

comes unconsciously on an amazing amount ofbotanical knowledge, and few people will

fail to recognize a rose, an apple, or an orchid. When our Neolithic ancestors, living in the

Middle East about 10,000 years ago, discovered that certain grasses could be harvested

and their seeds planted for richer yields the next season the first great step in a new

association of plants and humans was taken.Grains were discovered and from them

flowed the marvel of agriculture: cultivated crops. From then on, humans would

increasingly take their living from the controlled production of a few plants, rather than

getting a little here and a little there from many varieties that grew wild- and the

accumulated knowledge of tensof thousands of years of experience and intimacy with

plants in the wild would begin to fade away.

33 Plankton

Scattered through the seas of the world are billions of tons of small plants and animals

called plankton. Most of these plants and animals are too small for the human eye to see.

They drift about lazily with the currents, providing a basic food for many larger animals.

Plankton has been described as the equivalent of the grasses that grow on the dry land

continents, and the comparison is an appropriateone. In potential food value, however,

plankton far outweighs that ofthe land grasses. One scientist has estimated that while

grasses of the world produce about 49 billion tons of valuable carbohydrates each year,

the sea’s plankton generates more than twice as much.

Despite its enormous food potential, little effect was made until recently to farm plankton

as we farm grasses on land. Now marine scientists have at last begun to study this

possibility, especially as the sea’s resources loom even more important as a means of

feeding an expanding world population.

No one yet has seriously suggested that “plankton-burgers” may soon become popular

around the world. As a possible farmed supplementary food source, however, plankton is

gaining considerable interest among marine scientists. One type of plankton that seems to have great harvest possibilities isa tiny shrimp-like

creature called krill. Growing to two or three inches long, krill provides the major food for

the great blue whale, the largest animal to ever inhabit the Earth. Realizing that this whale

may grow to 100 feet and weigh 150 tons at maturity, it is not surprising that each one

34 Raising Oysters

In the oysters were raised in much the sameway as dirt farmers raised tomatoes- by

transplanting them. First, farmers selected the oyster bed, cleared the bottom of old shells

and other debris, then scattered clean shells about. Next, they ”planted” fertilized oyster

eggs, which within two or three weeks hatched into larvae. The larvae drifted until they

attached themselves to the clean shells on the bottom. There they remained and in time

grew into baby oysters called seed or spat. The spat grew larger by drawing in seawater

from which they derived microscopic particles of food. Before long, farmers gathered the

baby oysters, transplanted them once more into another body of water to fatten them up.

Until recently the supply of wild oysters and those crudely farmed were more than enough

to satisfy people’s needs. But today the delectable seafood is no longer available in

abundance. The problem has become so serious that someoyster beds have vanished

entirely.

Fortunately, as far back as the early 1900’s marine b iologists realized that if new

measures were not taken, oysters would become extinct or at best a luxury food. So they

set up well-equipped hatcheries and went to work. But they did not have the proper

equipment or the skill to handle the eggs. They did not know when, what, and how to feed

the larvae. And they knew little about the predators that attack and eat baby oysters by the

millions. They failed, but they doggedly kept at it. Finally, in the 1940’s a significant

breakthrough was made.

The marine biologists discovered that by raising the temperature of the water, they could

induce oysters to spawn not only in the summer but also in the fall, winter, and spring.

Later they developed a technique for feeding the larvae and

rearing them to spat. Going

still further, they succeeded in breeding new strains that were resistant to diseases, grew

faster and larger, and flourished in water ofdifferent salinities and temperatures. In

addition, the cultivated oysters tasted better!

35 Oil Refining

An important new industry, oil refining, grew after the Civil war. Crude oil, or petroleum - a

dark, thick ooze from the earth - had been known for hundreds of years, but little use had

ever been made of it. In the 1850’s Samuel M. Kier, a manufacturer in western

Pennsylvania, began collecting the oil from local seepages and refining it into kerosene.

Refining, like smelting, is a process of removing impurities from a raw material.

Kerosene was used to light lamps. It was a cheap substitute for whale oil, which was

becoming harder to get. Soon there was a large demand for kerosene. People began to

search for new supplies of petroleum.

The first oil well was drilled by E.L. Drake,a retired railroad conductor. In 1859 he began

drilling in Titusville, Pennsylvania. The whole venture seemed so impractical and foolish

that onlookers called it “Drake’s Folly”. But when he had drilled down about 70 feet (21

meters), Drake struck oil. His well began toyield 20 barrels of crude oil a day.

News of Drake’s su ccess brought oil prospectors to the scene. By the early 1860’s these

wildcatters were drilling for “black gold” all over western Pennsylvania. The boom rivaled

the California gold rush of 1848 in its excitement and Wild West atmosphere. And it

brought far more wealth to the prospectors than any gold rush. Crude oil could be refined into many products. For some years kerosene continued to be

the principal one. It was sold in grocery stores and door-to-door. In the 1880’s refiners

learned how to make other petroleum products such as waxes and

lubricating oils.

Petroleum was not then used to make gasoline or heating oil.

36 Plate Tectonics and Sea-floor Spreading

The theory of plate tectonics describes the motions of the lithosphere, the comparatively

rigid outer layer of the Earth that includes all the crust and part of the underlying mantle.

The lithosphere is divided into a few dozen plates of various sizes and shapes, in general

the plates are in motion with respect toone another. A mid-ocean ridge is a boundary

between plates where new lithospheric materialis injected from below. As the plates

diverge from a mid-ocean ridge they slide on a more yielding layer at the base of the

lithosphere.

Since the size of the Earth is essentially constant, new lithosphere can be created at the

mid-ocean ridges only if an equalamount of lithospheric material is consumed elsewhere.

The site of this destruction is another kind of plate boundary:

a seduction zone. There one

plate dives under the edge of another and is reincorporated into the mantle. Both kinds of

plate boundary are associated with fault systems, earthquakes and volcanism, but the

kinds of geologic activity observed at the two boundaries are quite different.

The idea of sea-floor spreading actually preceded the theory of plate tectonics. In its

original version, in the early 1960’s, it described the creation and destruction of the ocean

floor, but it did not specify rigid lithospheric plates. The hypothesis was substantiated soon

afterward by the discovery that periodic reversals of the Earth’s magnetic field are

recorded in the oceanic crust. As magma rises under the mid-ocean ridge, ferromagnetic

minerals in the magma become magnetized in the direction of the magma become

magnetized in the direction of the geomagnetic field. When the

magma cools and

solidifies, the direction and the polarity ofthe field are preserved in the magnetized

volcanic rock. Reversals of the field give rise to a series of magnetic stripes running

parallel to the axis of the rift. The oceanic crust thus serves as a magnetic tape recording

of the history of the geomagnetic field that can be dated independently; the width of the

stripes indicates the rate of the sea-floor spreading.

37 Icebergs

Icebergs are among nature’s most spectacular creations, and yet most people have never

seen one. A vague air of mystery envelops them. They come into being ----- somewhere

------in faraway, frigid waters, amid thunderousnoise and splashing turbulence, which in

most cases no one hears or sees. They exist only a short time and then slowly waste

away just as unnoticed.

Objects of sheerest beauty they have been called. Appearing

in an endless variety of

shapes, they may be dazzlingly white, or they may be glassy blue, green or purple, tinted

faintly of in darker hues. They are graceful, stately, inspiring ----- in calm, sunlight seas.

But they are also called frightening and dangerous, and that they are ---- in the night, in

the fog, and in storms. Even in clear weather one is wise to stay a safe distance away

from them. Most of their bulk is hidden belowthe water, so their underwater parts may

extend out far beyond the visible top. Also, they may roll over unexpectedly, churning the

waters around them.

Icebergs are parts of glaciers that break off, drift into the water, float about awhile, and

finally melt. Icebergs afloat today are made ofsnowflakes that have fallen over long ages

of time. They embody snows that drifted down hundreds, or many thousands, or in some

cases maybe a million years ago. The snows fell in polar regions

and on cold mountains,

where they melted only a little or not at all, and so collected to great depths over the years

and centuries.

As each year’s snow accumulation lay on the s urface, evaporation and melting caused the

snowflakes slowly to lose their feathery points and become tiny grains of ice. When new

snow fell on top of the old, it too turned to icy grains. So blankets of snow and ice grains

mounted layer upon layer and were of such greatthickness that the weight of the upper

layers compressed the lower ones. With timeand pressure from above, the many small

ice grains joined and changed to larger crystals, and eventuallythe deeper crystals

merged into a solid mass of ice.

38 Topaz

Topaz is a hard, transparent mineral. It is a compound of aluminum, silica, and fluorine.

Gem topaz is valuable. Jewelers call this variety of the stone

“precious topaz”. The

best-known precious topaz gems range in color from rich yellow to light brown or pinkish

red. Topaz is one of the hardest gem minerals. In the mineral table of hardness, it has a

rating of 8, which means thata knife cannot cut it, and that topaz will scratch quartz.

The golden variety of precious topaz is quite uncommon. Most of the world’s topaz is white

or blue. The white and blue crystals of topaz are large, often weighing thousands of carats.

For this reason, the value of topaz does not depend so much on its size as it does with

diamonds and many other precious stones, where the value increases about four times

with each doubling of weight. The value of a topaz is largely determined by its quality. But

color is also important: blue topaz, for instance, is often irradiated to deepen and improve

its color.

Blue topaz is often sold as aquamarine and a variety of brown

quartz is widely sold as

topaz. The quartz is much less brilliant and moreplentiful than true topaz. Most of it is

variety of amethyst: that heat has turned brown.

39 The Salinity of Ocean Waters

If the salinity of ocean waters isanalyzed, it is found to vary only slightly from place to

place. Nevertheless, some of these small changes are important. There are three basic

processes that cause a change in oceanic salinity.One of these is the subtraction of water

from the ocean by means of evaporation--- conversion of liquid water to water vapor. In

this manner the salinity is increased, since the salts stay behind. If this is carried to the

extreme, of course, white crystalsof salt would be left behind. The opposite of evaporation is precipitation, such as rain, by which water is added to the

ocean. Here the ocean is being diluted so that the salinity is decreased. This may occur in

areas of high rainfall or in coastal regions where rivers flow

into the ocean. Thus salinity

may be increased by the subtraction of water by evaporation, or decreased by the addition

of fresh water by precipitation or runoff.

Normally, in tropical regions where the sun isvery strong, the ocean salinity is somewhat

higher than it is in other parts of the world where there is not as much evaporation.

Similarly, in coastal regions where rivers dilutethe sea, salinity is somewhat lower than in

other oceanic areas.

A third process by which salinity may be altered is associated with the formation and

melting of sea ice. When sea water is frozen, the dissolved materials are left behind. In

this manner, sea water directly materials are leftbehind. In this manner, sea water directly

beneath freshly formed sea ice hasa higher salinity than it did before the ice appeared. Of

course, when this ice melts, it will tend to decrease the

salinity of the surrounding water.

In the Weddell Sea Antarctica, the densest water in the oceans is formed as a result of this

freezing process, which increasesthe salinity of cold water. This heavy water sinks and is

found in the deeper portions of the oceans of the world.

40 Cohesion-tension Theory

Atmospheric pressure can support a column ofwater up to 10 meters high. But plants can

move water much higher; the sequoia tree can pump water to its very top more than 100

meters above the ground. Until the end of the nineteenth century, the movement of water

in trees and other tall plants was a mystery.Some botanists hypothesized that the living

cells of plants acted as pumps. But many experiments demonstrated that the stems of

plants in which all the cells are killed can still move water to appreciable heights. Other

explanations for the movement of water inplants have been based on root pressure, a

push on the water from the roots at the bottom ofthe plant. But root pressure is not nearly

great enough to push water to the tops of tall trees. Furthermore, the conifers, which are

among the tallest trees, have unusually low root pressures. If water is not pumped to the top of a tall tree, and ifit is not pushed to the top of a tall tree,

then we may ask: how does it get there? According to the currently accepted

cohesion-tension theory, water is pulled there. The pull on a rising column of water in a

plant results from the evaporation of water at the top of the plant. As water is lost from the

surface of the leaves, a negative pressure, or tension, is created. The evaporated water is

replaced by water moving from inside the plant in unbroken columns that extend from the

top of a plant to its roots. The same forces that create surface tension in any sample of

water are responsible for the maintenance of these unbroken columns of water. When

雅思大作文范文三十篇

Topic 1: When international media (including movies, fashion shows, advertisements and other TV programs) convey the same messages to the global audience, people argue that the expansion of international media has negative impacts on cultural diversity. What is your opinion? 媒体信息一致的缺点: ?国际媒体(global media)—般掌握在少数几个有实力的机构手中(in the hands of a few, large, powerful organizations);有了媒体的宣传(propaganda)后,西方文化成了主流(domineering force),大规模的、有吸引力的广告(mass seductive advertising )唤起了落后地区人们对物质新的向往(create fresh desires),经济联系增强(strong economic ties),西方产品取代了本地产品,使人们更加向往西方的文化; ?文化开始融合在一起(mingle),人们被新的价值观所围绕(bombarded with new values),对自己的文化失去信心和自豪感(confidence and pride),拒绝接受自己的文化传统(rejection of their cultural heritage)转而接受西方的文化习惯(adoption of Western cultural practices);西方媒体削弱了民族的特征(ethnic identity)和社会的凝聚力(social cohesion);因为担心失去观众(a loss of viewers),当地的电视台也开始播放西方的电视节目(television shows), ?国际媒体的普遍会降低世界文化的品质和多样性(degrade the quality and diversity of world culture);文化被商业化(commercialized), —些文化产品(cultural goods),如音乐、服装,都变成了商品(commodities in the marketplace)。因此,即便一些文化在世界其他地方传播,它原来的性质(authenticity)已经丧失。 媒体信息一致的优点: ?国家之间的频繁交往会促进文化之间的交流。因此,相互了解和相互认同的可能性(likelihood of mutual understanding and mutual acceptance )就会增加,这是顺应全球化的趋势; ?未必一定放弃传统观念(not necessarily lead to the abolition of traditional values),事实上媒体可以起到宣传和稳固传统文化的作用; ?主流媒体一般都会反应文化多元性(The dominant media reflect cultural diversity.); —些外国节目其实促进了文化多元性(Most foreign programming is promoting cultural diversity.),适应了当地的条件(adapt to local conditions),注意到了当地文化的敏感性(aware of cultural sensitivity).自我调节来适应市场(exercise self-censorship to suit the market :)。 As international media companies expand across the world, the growing popularity and uniformity of some media programs (such as TV shows, movies, fashion shows) is causing worldwide concern. Many people have strong views toward this trend. In my opinion, international media is closely linked to cultural globalization and cultural homogeneity. The dominance of international media is a sign of Western cultural imperialism and has the potential to thwart cultural diversity. It is not a secret that international media is owned and operated by a handful of giant corporations, such as Time Warner. They control large sectors of the media market and place national media companies at risk. The contraction in the number of media owners will cause a proportional reduction, in the variety of programs broadcasted. For example, painting, music and movies accessible in the media have a small number of genres, imposing restraints on one's knowledge of artworks of different cultural backgrounds. In addition to seizing control over those creative industries, global entertainment companies affect cultural diversity by reshaping the perceptions, beliefs and norms of ordinary citizens in different countries. Most of the cultural values and ideals promoted by the leading mainstream media are of American origin. American culture values individuality, maximization of one's benefits and material wealth, rather than communal life and family solidarity, the values and norms previously treasured in" many Asian countries. Unfortunately, many Asian people now imitate American people, causing the alteration of their perceptions of family. This radical change can be attributed to those movies and TV programs that portray the success of American individuals or corporations.

雅思写作流程图解析

雅思写作流程图解析 朗阁海外考试研究中心刘雅敏 相比较其它小作文题型,雅思写作中的流程图对于很多考生来说都会感觉束手无策,尤其 是拿到题目时无从下手。这主要是由流程图的考察重点决定的。不同于图表题型在表达方 式上的固定,流程图更加能够考察考生“真正的”词汇量。虽然流程图出题频率不算高(去 年48场A类考试中,流程图出现6次),且普遍集中在工业生产过程和自然现象这两类,但题材差距很大,2014年的6场考试以及今年出现的2次流程图的具体题材如下: 由于题材不同,所以每次考试的词汇要求都不同,这无疑增加了考生的备考难度。 另外,一般情况下流程图都是以图片而非数字形式出现,所以有不少刚接触流程图的同学 认为它更接近大作文的语言风格。其实不然,流程图的文章风格偏客观描述,而且与其它 小作文题型一样,流程图还有一个特点——主要扩展顺序为时间顺序,这一点不同于大作 文主要以逻辑顺序为扩展顺序。无论大作文还是小作文,逻辑性是一切文章的灵魂,而要 想使流程图的写作逻辑严密,就要按照时间顺序展开,并加入恰当的时间顺序连接词。 除了小作文的共性外,流程图又有自身在表达方式上的特殊要求。具体而言,要注意两点:动词的使用和三大句型的运用。 一、动词的使用

考生面临的比较普遍的问题就是:图里面的词汇可能认识的只有一半,碰到这种情况,考 生应尽量猜,运用常识和看图猜词意。图里面可能会给出一定数量的动词,也可能没有给出。具体而言,一般会出现三种情况: 1. 图详细+注解详细 流程图中出现过的词汇可以使用一次,第二次出现的时候尽量换成其同义词甚至可以是近 义词。但即使猜出了大概含义,找出同义替换仍然比较困难。对此,有两种解决方案: 1). “名词动用”,如果原图给出了某个词的名词形式,在你的作文中可以将其转变成该词 的动词形式。同理,形容词可以换成副词(通常在该形容词后加-ly),副词变成形容词。 比如剑桥真题6 Test 3的范文中:原图第二个步骤中的“food”, 作者改成了动词“feed”。 2). 根据“下义词”,找出其“上义词”,比如说“furnace”(熔炉)在“玻璃瓶的回收”之类的 流程图中都会出现,我们称之为“下义词”(即含义较具体),而其“上义词”(即概括性较 强的表达)可以是“a container”。 2. 图详细+注解简略 这种情况要求考生把图片中出现的、而注解中表述比较简略而省掉的信息运用考生会的表 达方式补充出来,尤其注意动词的使用。比如:“玻璃瓶的回收”这一流程中有个步骤是把 碎玻璃倒进熔炉里面将其融化,图片画得较详细:一个椭圆形的鼎样容器,上面画的温度 计显示融化玻璃的具体温度数值,燃料是用木炭还是煤炭还是天然气……但下面的注解可 能只有三个单词:the melting process。显然,我们不可能只用这三个单词描述这一步骤,原因很简单,即考生都熟悉的一个悲剧——图描述完了,字数没写够!遇到这种情况,建议考生用自己的话把图表信息补充完整。 3. 图简略+注解更简略 同样还是以“玻璃瓶的回收”流程为例,其中一个步骤是玻璃瓶被重塑成新瓶子、并注入相 应液体产品后,被卡车送到超市,消费者购买并使用。该步骤在原图中只出现了两个名词——“supermarket”和“customers”。实战中有相当数量的考生只用一句话说完了这个步骤(比如:These bottles are transported by trucks to supermarkets, and then they would be bought by consumers.)。这种写法与上面的写法后果是一样的——

雅思写作经典范文 雅思小作文数据描述模板25个

雅思写作经典范文雅思小作文数据描述模板25个 1.the table shows the changes in the number of……over the period from……to…… 该表格描述了在……年之……年间……数量的变化。 2.the bar chart illustrates that…… 该柱状图展示了…… 3.the graph provides some interesting data regarding…… 该图为我们提供了有关……有趣数据。 4.the diagram shows (that)…… 该图向我们展示了…… 5.the pie graph depicts (that)……. 该圆形图揭示了……

6.this is a cure graph which describes the trend of…… 这个曲线图描述了……的趋势。 7.the figures/statistics show (that)…… 数据(字)表明…… 8.the tree diagram reveals how…… 该树型图向我们揭示了如何…… 9.the data/statistics show (that)…… 该数据(字)可以这样理解…… 10.the data/statistics/figures lead us to the conclusion that…… 这些数据资料令我们得出结论……

11.as is shown/demonstrated/exhibited in the diagram/graph/chart/table…… 如图所示…… 12.aording to the chart/figures…… 根据这些表(数字)…… 13.as is shown in the table…… 如表格所示…… 14.as can be seen from the diagram, great changes have taken place in…… 从图中可以看出,……发生了巨大变化。 15.from the table/chart/diagram/figure, we can see clearly that……or it is clear/apparent from the chart that…… 从图表我们可以很清楚(明显)看到……

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雅思真题作文解析 HUA system office room 【HUA16H-TTMS2A-HUAS8Q8-HUAH1688】

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