Growing levels of pollution represent a serious health hazard to the,local po...

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问题 Growing levels of pollution represent a serious health hazard to the,local population.

选项 A:protection
B:indication
C:immunity
D:danger

答案D

解析本句意思:日益严重的污染对当地人民的健康构成了重大威胁。hazard危险,危害。protection 保护,防卫;indication表明,标示,象征,显示;immunity免疫力,豁免,免除;danger危险,危险物,威胁。
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