2. 外语
  3. ______a weather warning system is established to help people away from danger heat? ______human activities contribute to global

______a weather warning system is established to help people away from danger heat? ______human activities contribute to global

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问题 ______a weather warning system is established to help people away from danger heat?
______human activities contribute to global warming?
选项 A、 
B、 
C、 
D、 
答案A
解析 A.指出全球变暖的祸因是人类的极端行为。
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