题目内容

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

试题分析：句意：我们高效率的新机器运行成本底多了。 四个选项的含义分别是：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热情的，所以选B。
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