2. 外语
  3. Different hypotheses have been put forward to explain why UFOs exist.

Different hypotheses have been put forward to explain why UFOs exist.

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问题 Different hypotheses have been put forward to explain why UFOs exist.
选项 A、sentence
B、comments
C、conclusions
D、theories
答案D
解析 句意：有很多不同的理论来解释为什么不明飞行物会存在。画线单词hypotheses意为“假说，理论”。A项sentence意为“句子，宣判”；B项comment意为“评论”；C项con—clusion意为“结论”；D项theory意为“推测，理论”，与画线单词意义相近。故本题选D。
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