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10. Our    new machines are much cheaper to run.

A. effective    B. efficient

C. energetic     D. enthusiastic

10. B考查形容词辨析。句意:我们高效率的新机器运行成本低多了。 effective有效的;efficient生效的,效率高的,有能力的;energetic精力充沛的;enthusiastic热情的。所以选B。

题目来源:2015全品语法快练高中英语新课标 > 训练7 介词、形容词、副词、动词及词组

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