Our new machines are much cheaper to run.

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

 

B

【解析】

試題分析：句意：我們高效率的新機器運行成本底多了。 四個選項的含義分別是：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熱情的，所以選B。

考點：考查形容詞辨析

 

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