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[主观题]

In the desert world, the seasons differ from one region to another. The Gohi ,which lies r

oughly between 35℃ and 55℃ north of the equator, is a good example of seasonal change.

Four seasons are characteristic of the Gobi: spring, summer, fall, and winter, with usually a false spring at the end of winter. These seasons are distinct, with extremes of temperature, as much as 150 between the hottest day in summer and the coldest day in winter.

Spring in the Gobi usually begins about the second week April. For 2 or 3 weeks there is a period of delightful weather, with warm, sunny days and not too much wind. But these are the days of false spring. About the first of May, the tail end of winter returns, and cold, blustery days of dustburdened winds are the rule then, until early or middle June. The latter part of June, for 2 or 3 weeks after the blowy end of winter is the real spring. It spreads its rather comfortable warmth over the desert, and occasional light rains help the desert grass to come along nicely.

July, or sometimes mid-June to mid-August is summer. Hot days are the rule, but the nights are cool. Wind and dust again govern the desert, but this is the season when hard rains, if they come at all, are most likely to dump water on the plains.

Fall usually may be recognized by the encouraging, bright days beginning in mid-August and lasting until mid-September or the first of October. This is the time of year when both men and beasts feel best in the Gobi. The clear air, bright sun, and frosty temperatures make you glad to be alive.

Winter comes with a rush anytime after the middle of September. One day you may be enjoying a pleasant temperature near the eighties. But suddenly the air cools. In a few hours the temperature has slipped below 50; and a little later cold rain changes to snow and blustering wind.

In this passage the author briefly describes ______.

A.the different seasonal changes

B.the effects of climatic change on msn and beasts

C.the Gobi as a terrible place to live in

D.the seasonal cycle of the Gobi

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更多“In the desert world, the seasons differ from one region to another. The Gohi ,which lies r”相关的问题

第1题

Land to support human beings is insufficient because______.A.most of the world"s land

Land to support human beings is insufficient because______.

A.most of the world"s land is unusable

B.farm land becomes desert due to climate change

C.populations in poor countries take up greater land

D.the world"s land is not distributed equally

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第2题

Land to support human beings is insufficient because______.A.most of the world's land is u

Land to support human beings is insufficient because______.

A.most of the world's land is unusable

B.farm land becomes desert due to climate change

C.populations in poor countries take up greater land

D.the world's land is not distributed equally

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第3题

The main idea of the second paragraph is that______.A.a country's wealth depends on many f

The main idea of the second paragraph is that______.

A.a country's wealth depends on many factors

B.the USA is one of the wealthiest countries in the world

C.the Sahara Desert is a very poor region

D.natural resources are an important factor in the wealth or poverty of a country

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第4题

The deserts of the world are not all covered with sand. Many of them have surfaces of rock
or clay or small stones. They are not flat, either. They often have high hills and deep valleys. There is some plants' life in many parts of the desert. There is little rain in the desert, but it does fall often enough for most plants.

The deserts of the world are not uninhabited (not lived by people). People also live outside oases(绿洲), but these people are not farmers. They have camels, goats, donkeys, sheep, etc. These animals can live on the desert plants and do not need much water.

The people of the desert have to move constantly from place to place, or they must always look for grass or desert plants for their animals. They usually live in tents. When there is no more food for their animals, they fold up their tents, put them on their camels and donkeys, and move to another place. In good years, when there is enough food for their animals, they trade their skins and their goats and camel hairs with the people of oases for wheat and fruit. But in bad years, when there is not enough food for their animals, the people of the desert would attack the oases people. But they are also hospitable, no man in the desert would ever refuse to give a stranger food and water.

In the desert______.

A.it rains in spring only

B.there is some rain, but far from enough

C.it rains for a short time every month

D.the rainfall is just enough for the plants

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第5题

The main idea of the second paragraph is that ______.A.the USA is one of the richest count

The main idea of the second paragraph is that ______.

A.the USA is one of the richest countries in the world

B.the Sahara Desert is a very poor region

C.a country's wealth depends on many factors

D.natural resources are an important factor in the wealth or poverty of a country

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第6题

We learn from the text that an ostrich can go a long distance at high speed asA.it is a sp

We learn from the text that an ostrich can go a long distance at high speed as

A.it is a special kind of bird

B.it lives in large desert areas

C.it has special wings and legs

D.it is the largest bird in the world

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第7题

"If we don't achieve some major step changes in crop yields by 2050," says Dr. James Hartw
ell, "there will be a major shortfall in available food to feed the world's population." It's a serious problem to which Hartwell and a team at Liverpool University may help fend part of a solution. They are investigating the unusual properties of a Madagascan plant, the Kalanchoe fedtschenkoi. Unlike other plants it captures its carbon dioxide at night and is ten times more water-efficient than crops such as maize, which means it is highly suitable for desert area. Making desert lands more amenable to crops will be increasingly important over the coming decades.

Hartwell has been fascinated by desert plants since he was an undergraduate, and his interest carried through to his doctorate and a research Fellowship, What Liverpool University has added to the research is sophisticated DNA sequencing technology. "We tapped into that," says Hartwell, "and realised it was perfect for going into our desert plants and starting to understand what genes they are using to survive desert conditions and, in particular, to perform. this nocturnal(夜间发生的) CO2 fixation that they do. "

This aspect of the plant is taking on major significance. "The Intergovernmental Panel on Climate Change has predicted that in the next 50 years, already droughty regions will become droughtier," explains Hartwell, "and if they will expand, there will be increasing desertification."

There are two possible directions in which the results of this research may be used. They are not actually producing a desert plant but their high level research may lead to that. They may be able to deploy (展开,移植)the knowledge and, potentially, some of the genes into food crops such as wheat and soy beans. Though, as Hartwell points out, it relies on Genetically Modified food becoming widely accepted.

The other route is that these plants could be grown for biomass (大面积高密度的)that could feed into biofuel production. "If this is viable we could perhaps provide, certainly a percentage, of the world's biofuel needs through using marginal land, and growing desert plants that are very happy to grow there. " With questions being asked about the impact of current biofuel production, as well as food production and prices, the research at Liverpool can create real possibilities for adapting land usage in a time of climate change.

We may infer from the flint paragraph that ______.

A.world population will be a serious problem in the future

B.Hartwell and his team has found a total solution to the food shortage

C.the Kalanchoe fedtschenkoi needs more water than other plants

D.making the crops fit to the desert conditions is significant

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第8题

Transportation use a to Be Much Slower than It Is NowFor many years in tile desert, camels

Transportation use a to Be Much

Slower than It Is Now

For many years in tile desert, camels used to be the only form. of transportation. Before the(51)of modern trains, camel trains used to carry al! the goods for trading between Central Africa and Europe. Traders sometimes(52)to put together camel trains with 10,000 to 15,000 animals. Each animal often carried(53)400 pounds and it could travel twenty miles a day. This form. of transportation was so important(54)camels were called the "ship of the desert".

Now modern trains travel across the desert in a very(55)time. One engine can pull as much weight as 135,000(56),in addition, trains use special cars for their load. Refrigerator cars carry food; boxcars carry heavy goods; stock cars carry animals; and tank cars carry oil.

(57)travel has changed, too. The earliest planes were biplanes, with two sets of wings. The top speed of this plane was 60 miles per hour. The pilots used to sit or lie on the wings in the open air. The plane (58)sometimes stopped in the middle of a trip. It used to be(59) to fly in bad weather. In snow or in rain, the wings frequently became icy.(60)the plane might go down.

Mechanical improvements during the First World War changed airplanes. Monoplanes took the place of biplanes. Pilots flew inside of covered cabins. Still, even these planes were small and expensive. Only(61)people were able to travel in airplanes.

Now modern jets make air travel possible for all people.(62)place in the world is more than 1 hours away by jet. Further improvements have(63)the cost of flying, and they have made air travel much safer than it used to be. A modern 707 can carry 170 people and can fly at 600 miles per hour. People(64)used to eat, sleep, or watch movies on airplanes.(65) these things are a normal part of air travel!

A.age

B.series

C.year

D.period

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第9题

TransportationFor many years in the desert, camels used to be the only form. of transporta

Transportation

For many years in the desert, camels used to be the only form. of transportation(运输). Before the(51)of modern trains, camel trains used to carry all the goods for trading between Central Africa and Europe. Traders sometimes(52)to put together camel trains with 10,000 to 15,000 animals. Each animal often carried(53)400 pounds and could travel twenty miles a day. This form. of transportation was so important that camels were called the "ships of the(54)."

Now modern trains travel across the desert in a very(55)time. One engine can pull as much weight as 135,000(56), In addition, trains use special cars for their load. Refrigerator cars carry food; boxcars carry heavy goods, stock cars carry animals; and tank cars carry oil.

Air travel has changed, too. The earliest planes were biplanes (双翼飞机), with(57)sets of wings. The top speed of this plane was 60 miles per hour. The pilots used to sit or lie on the wings in the. open air. The plane(58)sometimes Stopped in the middle of a trip. it used to be(59)to fly in bad weather. In snow or in rain, the wings frequently became icy. Then the plane might go down.

Mechanical improvements during the First World War changed airplanes. Monoplanes(单翼飞机) took the(60)of biplanes. Pilots flew inside of covered cabins. Still, even these planes were small and expensive. Only(61)people were be able to travel in airplanes.

Now modern jets make air travel possible for all people. No place in the world is more than 24 hours away by jet. Further improvements have(62)the cost of flying, and they have made air travel(63)safer than it used to be. A modern 707 can carry 170 people and can fly at 600 miles per hour. People(64)used to eat, sleep, or watch movies on airplanes.(65)these things are a normal part of air travel!

A.age

B.series

C.year

D.period

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第10题

One day, drought(干旱)may be a thing of the past at least in coastal cities. Vast areas of

One day, drought(干旱)may be a thing of the past at least in coastal cities. Vast areas of desert throughout the world may for the first time【C1】______to life and provide millions of acres of【C2】______where now nothing grows.

By the end of this century this may not be mere【C3】______. Scientists are already looking for the【C4】______of using some of the available ice in the polar regions. In these regions there are vast ice-caps formed by snow【C5】______over the past 50,000 years. Layer【C6】______.layer of deep snow means that, when melted, the snow water would be pure, not salty【C7】______sea-ice would be. There is so much potential pure water here【C8】______it would need only a fraction of it to turn much of the desert or poorly irrigated parts of the world【C9】______rich farmland. And what useful packages it would come in! It should be【C10】______to cut off a hit of ice and transport it!

【C11】______perhaps a passing iceberg(流冰)could be captured. They are always breaking away from the main caps【C12】______around, pushed by currents, until they eventually melt and are wasted. Many icebergs are, of course, far too【C13】______to be towed any distance, and would melt before they reached a country that needed them anywhere. It would be necessary to【C14】______one that was manageable and that was big enough to provide a good supply of ice when it【C15】______us. Engineers think that an iceberg up to seven miles long and one and a half miles wide could be transported【C16】______the tug pulling it was as big as a supertanker] Even then they would【C17】______only twenty miles every day. However, once the iceberg was at its【C18】______, more than 7,000 million cubic meters of water could be【C19】______from it!

That would probably be more than enough for any medium-sized city【C20】______in the hottest summer! But no doubt use could be made for it.

【C1】

A.go

B.come

C.recover

D.restore

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