While normal floods resulting from usual monsoon rainfall are________the growth of crops, recently there has been an increase in

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问题 While normal floods resulting from usual monsoon rainfall are________the growth of crops, recently there has been an increase in the frequency of high-intensity floods that do not have such welcome effects.
A. conducive to
B. hindered by
C. devastating for
D. deleterious to
E. essential for
F. indispensable to

选项

答案E,F

解析 逻辑连接词是while,表示前后让步转折。让步的部分说季风降雨带来的正常洪水对农作物生长是________的,转折的部分说最近频度和强度都增加了的洪水并没有这种受欢迎的效果。such在这里指代重复,因此空格要表达welcome effect(受欢迎的效果)的含义,是正评价,符合预期的是E项essential for和F项indispensable to(必要的)。
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