Flash floods are common in desert regions and were widespread before the evolution of trees and woodland soils, in contrast, fla

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问题 Flash floods are common in desert regions and were widespread before the evolution of trees and woodland soils, in contrast, flash floods are________in woodlands, where floodwaters, impeded by trees, form ponds.
A. overshadowed
B. redirected
C. obscured
D. precluded
E. mitigated
F. abated

选项

答案E,F

解析 空格表示洪水在树林当中被怎么样了,后面在说洪水被树木所阻断,形成了池塘(where floodwaters,impeded by trees,form ponds),所以空格应填入表示impede的类似概念。综上,D是可以选的,但是没有同义词,所以应当选择E、F。当然这里也可以理解为,in contrast表示的是前后的取反关系,所以这里对于前面的widespread取反即可。
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