完形填空。
Many scientists say that the world is getting hotter and hotter. If they are right, the ice at the North and
South Pole will melt eventually. If this happens, the sea will
1 and may cover most
2 all of Singapore. This
will force everybody to move to a
3 country.
We know that the sun
4the earth. The heat from the sun hits the
5 , and some of
6 goes back into the
sky. However, factories and cars
7 a lot of carbon dioxide (二氧化碳). When the gas rises into the sky, the
heat from the sun can come
8them but the heat from the ground cannot. It
9 near us in the sky and makes
the
10 hotter and hotter every year.
Scientists call this the "greenhouse effect" because a greenhouse is a small glass
11which is hot inside. It
is used for
12plants in cool countries. Many countries are
13about the greenhouse effect. They are trying
to stop factories and cars from sending
14gases into the sky. Scientists are not sure when the world will get
much hotter. Some people say that the greenhouse effect has
15already and has begun to affect the world's
weather.
( )1. A. rise ( )2. A. and ( )3. A. hotter ( )4. A. shines ( )5. A. ground ( )6. A. them ( )7. A. make ( )8. A. through ( )9. A. hides ( )10. A. cloud ( )11. A. building ( )12. A. putting ( )13. A. excited ( )14. A. dangerous ( )15. A. meant |
B. fall B. or B. larger B. circles B. sky B. it B. spread B. over B. continues B. air B. flat B. storing B. disappointed B. harmful B. improved |
C. change C. but C. safer C. covers C. mountain C. those C. produce C. into C. follows C. season C. tool C. cutting C. worried C. heavy C. started |
D. disappear D. till D. farther D. heats D. forest D. such D. form D. toward D. stays D. temperature D. machine D. growing D. pleased D. useful D. stopped |