填空模拟题

177. A certain additive put in gasoline to reduce air pollution is actually ______ groundwater, a finding that shows that even the most well-intentioned fixes can sometimes ______ .
A. liquefying, founder
B. contaminating, backfire
C. purifying, boomerang
D. saturating, reciprocate
E. polluting, prevail

178. The biologist's description of the wolf pack was trully ______ , devoid of any emotion or personal prejudice.
A. dispassionate
B. insubstantial
C. esoteric
D. capricious
E. indignant

题意解析及中文释义

题意解析及中文释义：

177.
题意解析：
actually提示添加剂起反作用效果，所以空格一填入reduce air pollution的反义词，候选B，E。再由most well-intentioned fixes和上文的添加剂是同种事物，所以选择B。
中文释义：
一些添加到汽油中减少空气污染的添加剂事实上会污染地下水，这一发现显示即使是最“善意”的药剂有时也可能造成相反的效果。

178.
题意解析：
由devoid of提示反义重复，空格填入emotion或者prejudice的反义词，选择A。
中文释义：
生物学家关于狼群的描述是真实客观的，没带任何情感和私人偏见。