2. 外语
  3. ______a weather warning system is established to help people away from danger heat? ______hot weather without ozone may cause s

______a weather warning system is established to help people away from danger heat? ______hot weather without ozone may cause s

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问题 ______a weather warning system is established to help people away from danger heat?
______hot weather without ozone may cause serious health problems associated with air pollution?
选项 A、 
B、 
C、 
D、 
答案B
解析 B主要论述了酷热引发的疾病主要是因为由空气污染导致的新鲜空气的匮乏。
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