阅读下列短文, 从所给的四个选项中, 选出最佳答案 Scientists are trying to make the deserts into good la

阅读下列短文, 从所给的四个选项中, 选出最佳答案

    Scientists are trying to make the deserts into good land again.They want to bring water to the deserts, so people can live and growfood. They are learning a lot about the deserts. But more of the earthis 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 thatpeople make deserts. People are doing bad things to the earth.

    Some places on the earth don't get much rain. But they still don'tbecome desert. This is because some green plants are growing there.Small green plants and grass are very important to dry places. Plantsdon'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 thewater. Without plants, the land can become desert more easily.

1. Deserts __________.  ［］  A. never have any plants or animals in them     B. can all be turned into good land before long    C. get very little rain     
D. both B and C    2. Small green plants are very important to dry places because____.      ［］  A. they don't let the sun make the earth even drier     B. they don't let the wind blow the earth away    C. they hold water     
D. all of the above    3. Land is becoming desert little by little because__________.      ［］  A. plants can't grow there     B. there is not enough rain    C. People haven't done what scientists wish them to do  D. scientists know little about the deserts      4. Which is the main idea of the first paragraph(自然段)?       ［］  A. Scientists know how to change desert into good land.  B. Land is becoming desert faster than scientists can change it  back into good land.     C. If scientists can bring water to desert, people can live and  grow food there.   D. More and more places are becoming deserts all the time.     5. After reading this, we learn that___________.［］  A. plants can keep dry land from becoming desert  B. it is good to get rid of the grass in the deserts   C. all places without much rain will become deserts   D. it is better to grow crops on dry land than to grow grass

试题答案

答案：C;D;C;B;A