答案：1.be trapped; causing; to go　 2.It　 3.There is no doubt that; warmer　 4.are called; which　5.Even if; and

　　Ⅳ.语法过关 it的用法(2) 完成下列句子，体会强调句的用法。 1．The greenhouse

　　effect gives the earth's surface the average temperature of 15℃. (强调划线部分) 2．I've forgotten where I put the dictionary. (强调划线部分) 3．The police were seeking more information to find out who ________ was that killed the rich merchant.

　　4．—When was ________ that he picked up French？—It was in 2010 when he traveled in France. 5．As we all know, ________ was not until recently that the problem was solved. 答案：1.It is the greenhouse effect that gives the earth's surface the average temperature of 15℃.

　　2．I've forgotten where it was that I put the dictionary. 3．it　4.it　5.it

　　Ⅴ.语篇填空 However, the attitude of scientists towards this rise is completely different. On the one hand, Dr Foster thinks that the trend which increases the temperature ①________ 5 degrees would be a catastrophe. She says, “We can't predict the climate well enough to know what to expect, ②________ it could be very serious.” Others ③________ agree with her think there may be a rise of several metres in the sea level, or predict severe storms, floods, droughts, famines, the spread of diseases and the ④________ (disappear) of species. On the other hand, there are those, like George Hambley, who are opposed ⑤________ this view, believe that we should not worry about high levels of carbon dioxide in the air. They predict that any warming will be mild with few bad ⑥________(environment) consequences. In fact, Hambley states, “More carbon dioxide is actually ⑦________ positive thing. ⑧________ will make plants grow ⑨________(quick); crops will produce more; it will encourage a greater range of animals—all of which ⑩________(make) life for human beings better.”

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