[答案] D. worthless.

　　[注释] 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。

　　[答案] B. performance.

　　[注释]performance (话剧的) 一场演出。

　　[答案] A. healed.

　　[注释] heal 1) 使痊愈, 治愈：The salve will help to heal the wound. (这种药膏能治愈你的伤。) 2) 痊愈 (多指外伤) ：The cut on my leg has healed. (我腿上的伤口以痊愈。) 可见, 本题是heal 的第二种用法。cure 治疗, 治好; The drug cured my fever. (这种药使我退烧了。) This medicine should cure you of your cold. (这种药定会治好你的感冒。) recover 也可以表示“痊愈”, 意为“恢复正常”。例如：1) I think she will recover. (我认为她会痊愈。) 2) He almost fell ill, but quickly recovered. (他差点病到, 但很快就痊愈了。) 也可以用recovered做表语表示“痊愈, 恢复正常：Are you completely recovered from your illness? (你的病是不是完全好了?)

　　[注意] 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。本题译文：过了很长时间我手上的伤口才痊愈。

　　[答案] B. make out.

　　[注释] make out 辨别

　　[答案] B. cleared up.

　　[注释] clear up 解释, 澄清; 解决：1) I had some doubts, but now they are cleared up. (以前我有许多疑点, 但现在都解决了。) 2)The book has cleared up many difficulties for me. (这本书解决了我不少困难。) clear away 清除。