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Our       new machines are much cheaper to run.
A．effectiveB．efficientC．energeticD．enthusiastic
B

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。
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