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13. think of_

14. seem to do_ 15. at that time_

13.想出 14.似乎要做 15.在那时

题目来源：长江作业本同步练习九年级英语上册人教版 > Unit 6 When was it invented?

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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 26 , the sea will rise and

may cover most 27 all of Singapore. This will force everybody to move to a 28 country.

We know that the sun 29 the earth. The heat from the sun hits the 30 , and some of it goes 31 into the sky. However, factories and cars 32 a lot of carbon dioxide(二氧化碳）. When the gas rises into the sky，the heat from the sun can come 33 them but the heat from the ground cannot. It 34 near us in the sky and makes the 35 hotter and hotter every year.

Scientists call this the “greenhouse effect” because a greenhouse is a small glass 36 which is hot inside. It is used for 37 plants in cool countries. Many countries are 38 about the greenhouse effect. They are trying to stop factories and cars from sending 39 gases into the sky. Scientists are not sure when the world will 40 much

hotter. Some people say that the greenhouse effect has started already and has begun to affect the world’s weather.

( )26. A. happens B. falls C. changes D. shows

( )27. A. of B. or C. but D. and

( )28. A. higher B. larger C. safer D. farther

( )29. A. looks B. covers C. circles D. heats

( )30. A. ground B. space C. forest D. plants

( )31. A. out B. back C. off D. of

( )32. A. make B. process C. produce D. form

( )33. A. through B. over C. into D. toward

( )34. A. hides B. continuevS C. follows D. stays

( )35. A. cloud B. air C. season D. temperature

( )36. A. building B. flat C. tool D. machine