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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 that people can live

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

admin2009-08-21  100
问题     Scientists are trying to make the deserts into good land again. They want to bring water to the deserts so that people can live and grow food. Even so, more and more of the earth is becoming desert all the time.
    Why? Scientists think that people make deserts. People are doing bad things to the earth. Some people on the earth do not get very much rain. Yet, they still do not become deserts. This is because there are some small green plants growing there. Plants help keep water in the earth. Plants do not let the wind blow the dirt away. Without plants, the land can become a desert much 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.
选项 A、grassy
B、wet
C、treeless
D、muddy
答案C
解析 本题为细节辨认题.由文章第二段"Some people on the earth do not get very much rain. Yet, they still do not become deserts. This is because there are some small green plants growing there. Plants help keep water in the earth. Plants do not let the wind blow the dirt away" 可以将A和B排除,而D文中没有提到,所以得出正确答案为C.
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