2. 外语
  3. It is pretty well understood______controls the flow of carbon dioxide in and out the atmosphere today.

It is pretty well understood______controls the flow of carbon dioxide in and out the atmosphere today.

admin2010-02-22  84
问题 It is pretty well understood______controls the flow of carbon dioxide in and out the atmosphere today.
选项 A、that
B、when
C、what
D、how
答案C
解析
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