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

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

admin2019-10-29  19
问题    Scientists are trying to make the deserts 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 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 don’t 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.
   A man decides to make a farm in a very dry place. He digs in the earth and takes away the grass and plants that are already growing on the dry land. He makes a farm. He puts plants in rows. The sun is very hot. It makes the land even drier. When the rain comes, it runs between the rows of plants. It washes the good dirt away. When the wind comes, it blows between the rows of plants. It blows the good dirt away. Soon the land is not good enough for a farm any more. The man lets his animals eat all the plants on it. Now the land does not have any plants on it. The sun and wind dry the land and all of the good dirt away. Now the land is a desert.
Land is becoming desert because of lack of______.
选项 A、rain
B、wind
C、people
D、plants
答案D
解析 文章中第一段中已经说明了“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”，这句话表达的意思是，小的绿色植物和草对干燥的地方十分重要，如果没有它们，土地就会变成沙漠。故选D项。
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