[视听材料] 英语四级单选题及解答 英语四级

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　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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