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题目来源 : 填空经典1500题
Select the two answer choices that, when used to complete the sentence, fit the meaning of the sentence as a whole and produce completed sentences that are alike in meaning.

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. 

overshadowed

redirected

obscured

precluded

mitigated

abated

Select two answer choices.

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