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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  23
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.
Which of the following is NOT the reason why small green plants are very important to dry places?
选项 A、They keep the earth from becoming even drier.
B、They do not let wind blow the earth away.
C、They add color to the dry places.
D、They hold water.
答案C
解析 本题题干问的是下列哪个选项不属于小的绿色植物对干旱地方重要的原因。根据文章第一段后面“Plants don’t let the sun make the earth even drier”可知A项是原因之一；根据第一段后面“Plants do not let the wind blow the dirt away”可知B项是原因之一；根据第一段倒数第二句“When a bit of rain falls，the plants hold the water”可知D项是原因之一。故选C项。
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