2. 外语
  3. What causes the greenhouse effect? It is __________. Why did the U.S. government plan to control the greenhouse gas emission?

What causes the greenhouse effect? It is __________. Why did the U.S. government plan to control the greenhouse gas emission?

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问题 What causes the greenhouse effect?
It is __________.

Why did the U.S. government plan to control the greenhouse gas emission?
Because it __________ for the emissions of greenhouse gas.
选项
答案bears some responsibilities
解析 本题问的是美国政府为什么要控制温室气体的排放呢。从第三段的前两句话中可以得知：占全球人口4%的美国排放的气体占温室气体排放总量的20%，由此可见，美国的责任重大。根据文中“Clearly，we bear some responsibility．”可知答案应为bears some responsibilities。
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