10. Our    new machines are much cheaper to run.

A. effective    B. efficient

C. energetic     D. enthusiastic

10. B考查形容詞辨析。句意:我們高效率的新機(jī)器運(yùn)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熱情的。所以選B。

題目來(lái)源:2015全品語(yǔ)法快練高中英語(yǔ)新課標(biāo) > 訓(xùn)練7 介詞、形容詞、副詞、動(dòng)詞及詞組

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