It is human activity      has caused this global warming.


  1. A.
    which
  2. B.
    that
  3. C.
    what
  4. D.
    why
B
解析：
考查強調(diào)句型。本句強調(diào)句子的主語�？梢园裪t is 和that去掉，句子Human activity has caused this global warming.句意：正是人類的活動導(dǎo)致了全球變暖。
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