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Our       new machines are much cheaper to run.

A.effective B.efficient C.energetic D.enthusiastic

B

解析试题分析:句意:我们高效率的新机器运行成本底多了。 四个选项的含义分别是: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,所以选B。
考点:考查形容词辨析

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