A certain additive put in gasoline to reduce air pollution is actually (i)______ groundwater, a finding that shows that even the

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问题 A certain additive put in gasoline to reduce air pollution is actually (i)______ groundwater, a finding that shows that even the most well-intentioned fixes can sometimes (ii)______.

选项

答案A,E

解析 actually说明前后反义重复。第一空与reduce air pollution(减少空气污染)反义重复。contaminate污染,purify净化,saturate浸润。答案选A。prevail奏效,backfire适得其反,reciprocate往复运动。答案选E。
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