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  3. Scientists are trying to make the desert into good land again. They want to bring water to the desert, so people can live and gr

Scientists are trying to make the desert into good land again. They want to bring water to the desert, so people can live and gr

admin2009-06-21  77
问题 Scientists are trying to make the desert into good land again.
They want to bring water to the desert, so people can live and grow food. They are learning a lot about the desert. 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 desert. 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 desert. 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.
选项 A、get very little rain
B、never have any plants or animals in them
C、can all be turned into good land before long
答案A
解析 从第二段第一句可知沙漠很少有雨。
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