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、 
D、 
答案B
解析
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