2. 外语
  3. What does the passage mainly discuss? The word "it" in line 21 refers to

What does the passage mainly discuss? The word "it" in line 21 refers to

admin2005-01-28  9
问题  What does the passage mainly discuss?
  The word "it" in line 21 refers to
选项 A、biological productivity
B、oil
C、organic material
D、petroleum
答案C
解析
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