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单选题 A certain amount of unemployment lubricates labor markets, maintaining a ready supply of workers for expanding businesses.
A.obscures
B.benefits
C.hinders
D.modifies
正确答案： B
答案解析: 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—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。
相关知识：一、词汇和语法
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