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3.Scientists are trying to make the deserts (沙漠) into good land again,They want to bring water to 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 in time.
Why is more and more land becoming 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 away.When a little bit of rain falls,the plants hold the water.Without plants,the land can become a desert much more easily.

36.DesertsA.
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
37.Small green plants are very important to dry places becauseD.
A.they don't let the sun make the earth even drier
B.they don't let the wind blow the earth away
C.they hold the water
D.all of the above
38.Land is becoming desert little by little becauseC
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
39.Which is the main idea of the first paragraph?B
A.Scientists know how to change desert into good land.
B.Land is becoming desert faster than scientists can change it back into good land,
C.If scientists can bring water to desert,people can live and grow there.
D.More and more places are becoming deserts all the time.
40.After reading this,we learn that,A.
A.plants can keep dry land from becoming desert
B.it is good to get rid of the grass in the desert
C.all places without much rain will become deserts
D.it is better to grow crops on dry land than to grow grass.

分析 科学家正力图将沙漠重新变成良土.他们想将水引入沙漠,以便人们生活及种植食物.他们对沙漠做了很多研究了解,但是地球的沙漠化却愈演愈烈,科学家可能也无法将其改变.
   为什么越来越多的土地变成沙漠?科学家认为是人类制造了沙漠.人类正在破坏地球.地球上的一些地方雨下得不多,但是这些地方仍旧没有变成沙漠,这是因为那里生长了一些绿色植物.小小的绿色植物和植被对干旱地区很有益.它们能防止烈日将土壤照射得更干旱,也能防止风将土吹走.当下了一点雨之后,植被能够保存水分.没有植物,土地会更容易变成沙漠.

解答 36.A.推理判断题.根据They want to bring water to the deserts,so people can live and grow food.可以推断沙漠的雨水很少.故选A.
37.D.细节理解题.根据Plants don't let the hot sun make the earth even drier.Plants don't let the wind blow the dirt away.When a little bit of rain falls,the plants hold the water.可知它们能防止烈日将土壤照射得更干旱,也能防止风将土吹走.当下了一点雨之后,植被能够保存水分.所以选项ABC都有提及,故选D.
38.C.推理判断题:根据Scientists think that people make deserts.People are doing bad things to the earth.可知科学家认为人类正在破坏地球,是人类制造了沙漠,说明人们的做法违背了自然规律,没有按照科学家希望的那样去做,所以C正确.故选C.
39.B.段落大意题.根据Scientists are trying to make the deserts (沙漠) into good land again和But more and more of the earth is becoming desert all the time.可知科学家正力图将沙漠重新变成良土,但是地球的沙漠化却愈演愈烈.故选B.
40.A.推理判断题.根据Without plants,the land can become desert more easily.可知植物可以阻止土地变成沙漠.故选A.

点评 本篇是一篇健康环保类阅读短文.解决阅读理解类题目,应掌握阅读的技巧与方法,初读掌握其大意,然后带着问题去文中找答案,最后检查核实答案,确保答案的正确性.

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