2. 外语
  3. Several______for global warming have been suggested by climate researchers.

Several______for global warming have been suggested by climate researchers.

admin2012-06-13  85
问题 Several______for global warming have been suggested by climate researchers.
选项 A、systems
B、sentences
C、fallacies
D、hypotheses
答案D
解析 句子大意为：气象学家提出了一些关于全球变暖的——。将各选项代人，只有hypotheses“假定；臆测”符合题意，因此本题选D。
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