2. 外语
  3. A desert is a land【C1】______plants, animals, and people cannot get all the water they need because the climate is【C2】______too d

A desert is a land【C1】______plants, animals, and people cannot get all the water they need because the climate is【C2】______too d

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问题    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.
【C9】
选项 A、have brought up
B、has brought
C、have led up to
D、has caused up
答案B
解析 本题既考查主谓一致，又考查词义。空格中谓语动词的主语是 the discovery，是单数名词，首先排除选项A和C。没有D选项中cause up的用法，所以只能选B。
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