92. B. disastrous.[详解] disastrous 灾难性的。

91. B. likelihood[详解] 句意：概率是对事件发生的可能性的数学研究。

90. D. expedition.

　[详解]expedition 远征, 探险; excursion 短途旅行, 游览; execution 实施, 执行; extraction 提取。

89. D. determination.[详解] determination意为“决心”, 后常接动词不定式作定语。

88. A. despair.[详解] despair of (=be in despair) 对.......失望：1) Don't despair: things will get better soon. 2) He began to despair of success. 3) He despaired of being able to repair the TV set. (他对能否修好这台电视机表示失望。) designate指明, 指出, despise 轻视, 藐视。

87. D. awake.[详解]awake adj.醒着的 (作表语) 。Awake, awaken, wake, waken都可以作及物和不及物动词用, 但是awake多用作不及物动词, 其中wake最常用。

86. C. out of practice.[详解] out of practice荒废, 久不练习; out of date 过时, 老式; out of touch失去联系; out of place详见 III, 70注释。

85. B. cleared up.[详解] 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。详见III.32.break away 和 break down 详见Ⅲ.6,7,11.注释.

84. B. make out.[详解] make out 辨别, 详见III.123.注释.

83.　 A. healed.

　[详解] 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. (我认为她会痊愈的。) 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。