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A Soot’s Role in Changes in the Climate and the Atmosphere B Observations of Warming in the Northern Hemisphere C Explanation
A Soot’s Role in Changes in the Climate and the Atmosphere B Observations of Warming in the Northern Hemisphere C Explanation
admin
2009-06-15
68
问题
A Soot’s Role in Changes in the Climate and the Atmosphere
B Observations of Warming in the Northern Hemisphere
C Explanation of Increased Warming Effect Caused by Soot
D Effort to Reduce Snow Albedo
E Ways to Reduce Soot Emission
F Greenhouse Gases as the Main Factor of Global Warming
A produces much more global warming than a carbon-dioxide forcing0f the same magnitude
B contributed to 25 percent of observed global warming
C can produce greenhouse gases
D absorb more of sun’s energy and warmth than white background
E still surpass soot in warming the world’s climate during the last century
F can be seen mostly in the Northern Hemisphere
选项
答案
B
解析
选择B的依据是第一段。有关的句子是:“...black soot may be responsible:for 25 percent of observed global warming over the past century.”选项B中用了过去式contributed,也是选B的一个线索,-因为第五题的题干中有in the twentieth century,这个时间状语要求谓语动词用过去式,而4个选项中只有B项的动词用的是过去式。
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