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.a(chǎn)ll 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.a(chǎn)ll places without much rain will become deserts
D.it is better to grow crops on dry land than to grow grass.

分析 科學(xué)家正力圖將沙漠重新變成良土.他們想將水引入沙漠,以便人們生活及種植食物.他們對沙漠做了很多研究了解,但是地球的沙漠化卻愈演愈烈,科學(xué)家可能也無法將其改變.
   為什么越來越多的土地變成沙漠?科學(xué)家認(rèn)為是人類制造了沙漠.人類正在破壞地球.地球上的一些地方雨下得不多,但是這些地方仍舊沒有變成沙漠,這是因為那里生長了一些綠色植物.小小的綠色植物和植被對干旱地區(qū)很有益.它們能防止烈日將土壤照射得更干旱,也能防止風(fēng)將土吹走.當(dāng)下了一點雨之后,植被能夠保存水分.沒有植物,土地會更容易變成沙漠.

解答 36.A.推理判斷題.根據(jù)They want to bring water to the deserts,so people can live and grow food.可以推斷沙漠的雨水很少.故選A.
37.D.細(xì)節(jié)理解題.根據(jù)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.可知它們能防止烈日將土壤照射得更干旱,也能防止風(fēng)將土吹走.當(dāng)下了一點雨之后,植被能夠保存水分.所以選項ABC都有提及,故選D.
38.C.推理判斷題:根據(jù)Scientists think that people make deserts.People are doing bad things to the earth.可知科學(xué)家認(rèn)為人類正在破壞地球,是人類制造了沙漠,說明人們的做法違背了自然規(guī)律,沒有按照科學(xué)家希望的那樣去做,所以C正確.故選C.
39.B.段落大意題.根據(jù)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.可知科學(xué)家正力圖將沙漠重新變成良土,但是地球的沙漠化卻愈演愈烈.故選B.
40.A.推理判斷題.根據(jù)Without plants,the land can become desert more easily.可知植物可以阻止土地變成沙漠.故選A.

點評 本篇是一篇健康環(huán)保類閱讀短文.解決閱讀理解類題目,應(yīng)掌握閱讀的技巧與方法,初讀掌握其大意,然后帶著問題去文中找答案,最后檢查核實答案,確保答案的正確性.

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