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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

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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.
It can be inferred from the passage that______.
选项 A、it is bad to plant in rows in a dry place
B、it is better to raise animals on dry land than to make a farm
C、it is bad to make a farm in a dry place, but it is good to raise animals there
D、all lands that don’t get very rain are deserts
答案A
解析 文章第二段通过举例，讲述了建立农场和养动物都是不明智之举，这样对土地沙漠化都有影响，可排除B、C两项。D项中间有个all，虽然与not连用，表示的是部分否定，但是过于绝对。因为“不是雨水少就会是沙漠”。故选A项，即“在干旱的地方种植成排的植物不明智”。
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