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标题: [视听材料] 英语四级单选题及解答 [打印本页]

作者: shimianmaifu    时间: 2016-9-29 15:06     标题: 英语四级单选题及解答

 第一组:  1. The vacuum cleaner is a valuable labor-saving ______ action.   A. device B. engine C. piece D. instrument
  2. The flight was postponed because of technical problems and was finally cancelled last week when a ______ was discovered.   A. accident B. defect C. damage D. defeat
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