Scientists are trying to make the deserts ,which get very little rain, into good land agai

Scientists are trying to make the deserts ,which get very little rain, 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 against the scientists’ wish．
Some places on the earth don’t get 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 sun make the earth even drier． Plants do not let the wind blow the dirt away．When a bit of rain falls，the plants hold the water. Without plants, the land can become desert more easily．
【小题1】Deserts ． A．never have any plants or animals in themB．can all be turned into good land before longC．are becoming smaller and smallerD．get very little rain【小题2】More and more land is becoming desert because ． A．plants can’t grow thereB．there is not enough rainC．people haven’t done what scientists wish them to doD．scientists know little about the deserts【小题3】Small green plants are very important to dry places because A．they don’t let the sun make the earth even drierB．they don’t let the wind blow the soil awayC．they hold waterD．All of the above．【小题4】After reading this passage, we learn that ． A．plants can keep dry land from becoming desertB．it is good to get rid of the grass in the desertsC．all places without much rain will become desertsD．it is better to grow crops on dry land than to cut themD

(答案→)D 解析：根据文章内容可知植物对于水土保持的重要性。【小题1】D 细节题。根据第一段第一句Scientists are trying to make the deserts ,which get very little rain说明D正确。【小题2】C 推理题。根据第二段最后一句People are doing bad things to the earth against the scientists’wish。说明人们的做法违背了自然规律，故C正确。【小题3】D 细节题。根据文章第三段2,3,4行．Small green plants and grass are very important to dry places．Plants don’t let the sun make the earth even drier． Plants do not let the wind blow the dirt away．When a bit of rain falls，the plants hold the water.说明ABC三项都是Small green plants的作用，故D正确。【小题4】A 推理题。根据文章第三段内容可知植物对于水土保持是非常重要的。故A正确。

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