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[主观题]

A desert is a land【C1】______plants, animals, and people cannot get all the water they need

because the climate is【C2】______too dry or too cold.【C3】______deserts have【C4】______than 10 inches of rainfall a year. There may be months or even years between one rainstorm and【C5】______. The rainwater quickly runs【C6】______the land, sinks into the sand or evaporates into the dry air.

No matter how dry a desert may be, it is【C7】______to man. In some of the driest regions【C8】______has found valuable minerals. The discovery of petroleum, in particular,【C9】______great changes to the deserts. Oil is now the most important export of several desert countries in the Middle East, and it has been【C10】______in the Western Sahara. Saudi Arabia, Iraq and Kuwait are【C11】______called oil kingdoms.

Man has changed the desert in many ways to make it a【C12】______place to live in. But the greatest problem of the deserts【C13】______. That problem is【C14】______water over large areas. Man is turning to the sea【C15】______water.

Scientists are constantly【C16】______methods of【C17】______the salt from water so that it can be used in industry and agriculture. This is called desalinization. Perhaps the use of atomic power will make desalinization less expensive in the future. Some people believe that man will one day be able to【C18】______the climate and produce rainfall over the desert when it is wanted. This would be a simple【C19】______to the water problem, but we【C20】______much more about the atmosphere before that will be possible.

【C1】

A．there

B．where

C．which

D．that

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发布时间：2020-09-24

更多“A desert is a land【C1】______plants, animals, and people cannot get all the water they need”相关的问题

第1题

Newton N. Minow said, “if each of the audience sit down in front of their television

A.a cultural wasteland

B.a neglected land

C.a desert

D.a barren land

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第2题

Egyptians have grown crops well______.A．on both sides of the NileB．on the land near the de

Egyptians have grown crops well______.

A．on both sides of the Nile

B．on the land near the desert area

C．on the Nile valley

D．far away from the desert area

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第3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4题

Land is becoming desert little by little because ______.A．plants can't grow thereB．there i

Land is becoming desert little by little because ______.

A．plants can't grow there

B．there is not enough rain

C．people haven't done what scientists wish them to do

D．scientists know little about the deserts

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第5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6题

Science at the present time is often applied to ______.A．boost production of grainB．constr

Science at the present time is often applied to ______.

A．boost production of grain

B．construct first-rate transportation system

C．turn out sophisticated weapons used for mass killing in war

D．turn desert into fertile land

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第7题

Scientists are trying to make the deserts into good land again. They want to bring water t

o the deserts, so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert. Scientists think that people make deserts. People are doing bad things to the earth.

Some places on the earth don't get very much rain. But they still don't become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don't let the hot sun make the earth even drier. Plants don't let the wind blow the dirt(土)away. When a little bit of rain falls, the plants hold the water. Without plants, the land can become a desert much more easily.

Deserts ______.

A．get very little rain

B．never have any plants or animals in them

C．can all be turned into good land before long

D．both A and C

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第8题

阅读：Over vast areas of every continent,the rainfall and vegetation necessary for life are disappearing

Questions 26 to 30 are based on the following passage:

Over vast areas of every continent,the rainfall and vegetation necessary for life are disappearing.Already more than 40 percent of the earth's land is desert or desertlike.About 628 million people—one out of seven—live in these dry regions.In the past,they have managed to survive,but with difficulty.[ZZ(Z]Now largely through problems caused by modern life,their existence is threatened by the slow,steady spread of the earth's deserts. Scientists still do not understand all the complex problems of the desert,but there have been many ideas for saving the land.Sandi Arabia has planted 10 million trees to help keep the sand from taking over fertile areas.The Israelis are aga in using some of the water collection systems left by the ancient people in the　Negev desert.They plan to water their orchards with the extra water.Some Sahel farmers still raise cattle on their poor farm land,but before the cattle are sold, they are taken to greener lands in the south to get fat.

26. What is the article mainly concerned？

A.The problem of spreading desert.

B.The rainfall and vegetation in desert areas.

C.The water collection systems.

D.The difference between modern life and ancient life. 

27. “one out of seven” refers to____.

A.more than a third of the lands' earth

B.the percentage of the earth's land that is desert-like

C.the number of people who live in dry regions

D.a day of a week 

28. In paragraph 2,“they are taken to the greener lands in the south.”They refers to____.

A.the Sahel farm land

B.the farmers

C.the cattles

D.the trees 

29. How many ideas for saving the land are described？

A.Five. B.Two. C.Four. D.Three. 

30. Which of the following statements is true, according to the passage？

A.The earth's desert are slowly spreading.

B.One out of 10 people lives in dry regions.

C.Their life in the desert is threatened now by traditional problems.

D.New water wells can solve the problem in Africa's desert.

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第9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10题

Forests have always been useful and important to man who make use of them in many ways. Ev

ery day trees are serving man everywhere. Trees supply man with fruits and building materials in the form. of wood. Without trees it would be impossible to build houses, boats, bridges and so on. Furniture such as desks, chairs and beds is made of wood. Trees can stop man from terrible heat. They're also useful in preventing good and rich top soil from being washed away during heavy rains.

If there were no trees, heavy rains would wash away the rich top soil that is so important to plants. The result is that the land will become a desert. There are plenty of desert areas in the world. A long time ago these desert areas used to be very rich areas, but man in the past had not enough knowledge about science of nature, they cut down too many trees in the area where they lived and never planted new ones. By and by the rich top soil was blown and washed away by strong winds and heavy rains. In the end the rich land changed into useless deserts where nothing could grow.

According to the passage, ______.

A．a long time ago, man did not know how to make use of wood

B．trees are not as useful as they were in the past

C．trees were more found in the past than they are today

D．people have 'always found trees useful

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