2. 外语
  3. 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

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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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