2. 外语
  3. ______ results in "Acid rain"? ______ is already the 2nd largest source of electricity in the U.S.?

______ results in "Acid rain"? ______ is already the 2nd largest source of electricity in the U.S.?

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问题 ______ results in "Acid rain"?
______ is already the 2nd largest source of electricity in the U.S.?
选项 A、 
B、 
C、 
答案B
解析
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