2. 外语
  3. ______results in "Acid rain"? ______can be taken only when large enough collector plates are built?

______results in "Acid rain"? ______can be taken only when large enough collector plates are built?

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问题 ______results in "Acid rain"?
______can be taken only when large enough collector plates are built?
选项 A、 
B、 
C、 
D、 
答案D
解析
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