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(jī)器運(yùn)行成本底多了。 四個(gè)選項(xiàng)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(diǎn)：考查形容詞辨析

 

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