2. 外语
  3. It can be concluded that a concentration of carbon dioxide in the atmosphere would ______. the article was written to explain _

It can be concluded that a concentration of carbon dioxide in the atmosphere would ______. the article was written to explain _

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问题 It can be concluded that a concentration of carbon dioxide in the atmosphere would ______.
the article was written to explain ______.
选项 A、the models of solar-weather interactions
B、the causes affecting weather
C、the greenhouse effect
D、the solar effects on the earth
答案B
解析 主旨题。文章从二氧化碳引发温室效应入手，然后说明了地球变暖的后果和这一过程中的一些矛盾现象，并在第五段提出了主旨问题：哪个自然因素对天气影响最大，然后着重分析了太阳的影响。由这些内容不难看出，文章的主旨当然是说明影响天气的一些原因。其他三项都只是文章的部分内容，不能作为全文主旨。
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