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  3. ______a weather warning system is established to help people away from danger heat? ______heat can be predicted because of natu

______a weather warning system is established to help people away from danger heat? ______heat can be predicted because of natu

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问题 ______a weather warning system is established to help people away from danger heat?
______heat can be predicted because of natural cycle?
选项 A、 
B、 
C、 
D、 
答案A,D
解析 天气状况因其在自然界中是周而复始的，所以可以预测。
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