【题目】Our new machines are much cheaper to run．
A．effective B．efficient
C．energetic D．Enthusiastic
在线课程【答案】B
【解析】
试题分析：考查形容词词义辨析。句意：我们高效率的新机器运行成本低多了。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；根据词义，故选B项。
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