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【题目】Our new machines are much cheaper to run.

A.effective B.efficient

C.energetic D.Enthusiastic

【答案】B

【解析】

试题分析:考查形容词词义辨析。句意:我们高效率的新机器运行成本多了。A. effective有效的,B. efficient生效的、效率高的;有能力的, C. energetic精力充沛的,D enthusiastic热情的;根据词义,故选B项。

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