【題目】Our new machines are much cheaper to run．

A．effective B．efficient

C．energetic D．Enthusiastic

【答案】B

【解析】

試題分析：考查形容詞詞義辨析。句意：我們高效率的新機器運行成本低多了。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熱情的；根據(jù)詞義，故選B項。

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