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81. Im afraid this painting is not by Picasso. Its only a copy and so its _____. A. priceless B. invaluable C. unworthy D. worthless D. worthless. worthless 无价值的, 无用的。Priceless 无价的, 贵重的, 无法估价的：a priceless treasure 无价之宝。Invaluable 无法估价的, 非常宝贵的。Unworthy 不值得的, 不配的; 无价值的。 82. The final _____ of the play will take place on Monday. A. action B. performance C. view D. sight B. performance. performance 一场演出。 83. It was a long time before the cut on my hand _____ completely. A. healed B. cured C. improved D. recovered A. healed. heal 1) 使痊愈, 治愈：The salve will help to heal the wound. 2) 痊愈 ：The cut on my leg has healed. 可见, 本题是heal的第二种用法。cure治疗, 治好; The drug cured my fever. This medicine should cure you of your cold. recover也可以表示痊愈, 意为恢复正常。例如：1) I think she will recover. 2) He almost fell ill, but quickly recovered. 也可以用recovered做表语表示痊愈, 恢复正常：Are you completely recovered from your illness? recover vi. 用作痊愈时, 句子主语通常是人。Improve 改善, 此词无治疗或痊愈之意。 | 
