Several______for global warming have been suggested by climate researchers.

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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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