A certain amount of unemployment lubricates labor markets, maintaining a ready supply of workers for expanding businesses.

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问题 A certain amount of unemployment lubricates labor markets, maintaining a ready supply of workers for expanding businesses.

选项 A、obscures
B、benefits
C、hinders
D、modifies

答案B

解析 本题考查词义辨析。A选项意为“使费解;掩盖”,B选项意为“对某人有用;得益于”, C选项意为“妨碍”,D选项意为“修改;减轻,减缓”。题干替换词意为“润滑,促进”。本题的思路在maintaining一词上,分词短语和替换动词均为unemployment能做到的事或造成的后果。…supply of workers for…很显然是正面积极的事情,故答案为最接近的B。
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