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Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.


  1. A.
    may; while
  2. B.
    can; as
  3. C.
    must; though
  4. D.
    should; for
B
试题分析:考查情态动词和连词,第一空填could,表示客观可能,第二空填as,引导时间状语从句,表示当…时候,随着,句意:爬山可能让人疲劳,随着空气变得稀薄很多人会感到不适。选B。
考点:考查情态动词和连词
点评:could可以表示“有能力”或者是“有客观的可能”,还有同样是当…时候,while表示“一段时间”,as表示“随着”。
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