完形填空。
Scientists are trying to make the desert into good land again. They want to bring
1 to the desert,
so people can live and grow food. They are
2 a lot about the desert. But
3 of the earth is
becoming desert all the time, scientists may not be able to
4 . the deserts. Scientists think that
people make deserts. People are doing
5 things to the earth.
Some places on the earth don't get
6 . But they still don't become deserts. This is _
7 _ some
green plants are growing there. Small green plants and grass are very
8 to dry places. Plants don't
let the wind blow the earth away. When
9 _ bit of rain falls, the plants hold the water.
10 plants,
the land can become a desert much more easily.
( )1. A. food
( )2. A. learning
( )3. A. fewer and fewer
( )4. A. use
( )5. A. good
( )6. A. little rain
( )7. A. because
( )8. A. careful
( )9. A. a little
( )10. A. With |
B. water
B. writing
B. less and less
B. change
B. better
B. much warm
B. for
B. helpful
B. a few
B. Without |
C. money
C. buying
C. more and more
C. lose
C. bad
C. much rain
C. as
C. forgetful
C. a lot
C. For |