Poor health and lack of money may both be ______to educational progress.

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问题 Poor health and lack of money may both be ______to educational progress.

选项 A、restraints
B、stains
C、scarcities
D、barriers

答案D

解析 名词辨析 四选项的意思分别为:A) restraints "束缚,约束”,常与of连用,restraint of trades;B) stains“污点”;C) scarcity "稀少”;D)barriers "障碍”,barrier to为固定搭配,根据句子的前因后果,只能填入barriers 一词。
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