192.[答案]B. pains. [详解]take pains to do sth.下苦功夫做某事：I'm grateful because you have taken pains to show me how to do the work.

191.[答案]C. at all.[详解]at all全然，真地(常用于肯定句中)：If you do it at all, do it well.(你若真做，就得做好。)not...at all全不，毫不：He doesn't seem at all interested in my plane.(他似乎对我的计划毫无兴趣。)above all(=most important of all)最重要的。in all总计：We were fifteen in all.(我们总计15人。)after all毕竟，终究。本题译文：他是否努力工作到并不重要，问题是他是否真正地做了。

190.[答案]C. tolerable.

　[详解]tolerable(=fairly good, not too bad)可忍受的：The pain has become tolerable. manageable可处理的;可管理的;controllable可控制的;perceivable可觉察的。

　本题译文：料想到的嗓音通常情况下比起等量的意外嗓音来说是可以忍受的。

189.[答案]B. stay.[详解]preserve, stay, maintain, reserve这4个词均有“保持”，“维持”之意。stay后可接形容词作表语：The weather stayed wet for three days.其他3个词均为及物动词。Preserve(=keep safe from decay, risk, harm, danger, going bad etc.)保存，保护：1)Policemen preserve order in the streets.(警察在街上维持秩序。) 2)We must preserve our natural resources.(我们必须保护自然资源。)3)You paint woodwork to preserve it.(你油漆木制品以防腐烂。)Maintain(=keep up)保持，维持，维修。Reserve(=keep for a special purpose; store)保留，预定：1)I'll reserve my opinion at his time,(这时我将保留我的看法。) 2)I'll phone up today and reserve a room.(我今天将打电话预定一个房间。)

　本题译文：专家们说，步行是一个人保持健康的最好方法之一。

188.[答案]D. hang on.[详解]hang on(=hold fast, keep hold)牢牢抓住，抓紧不放：Help! I can't hang on much longer.(救命啊!我支持不住啦。)keep on(doing sth.)继续(做......);catch on 理解;count on 指望，依赖。本题译文：杰克差点从悬崖上掉下来，但得以抓住不放直到得救。

187.[答案]B. scarcity.[详解]scarcity(=the state of being scarce)缺乏;不足(指原本充足之物暂时在数量上的缺乏)。例如：The scarcity of fruit was caused by the drought.(水果的供应不足是干旱所引起的。)rarity(=sth. uncommon, unusual or sth. valued because rare)珍稀，稀少：Snow is a rarity around the equator.(雪在赤道周围是罕见之物。)invalidity(=making weak by illness; not suitable for use)无效性，丧失工作能力。Variety(=difference of condition or quality)变化，多样化。

　本题译文：目前席卷这一地区的暴风雨今后肯定会引起蔬菜短缺。

186.[答案]A, release.[详解]release(=allow news to be published)发布(新闻)：Details of the scheme have not yet been released to the public.(这项计划的细节尚未向公众发布。)relieve 1)减轻(痛苦，紧张情绪等)：What will relieve a headache? This will help to relieve our hardship. 2)使放心，使宽慰：The good news relieved us, for we had been very anxious. 3)赈济，救济：The fund is for relieving distress among the flood victims. 4)relieve...from(of)解除，免除; a. This medicine will help to relieve you from your pain. b. He was relieved of his duties.retain(= keep; continue to have or hold)保持，继续保有：1)She retains a clear memory of her schooldays. 2)You must retain your tickets.

185.[答案]D. moderate.[详解]moderate(=make or become less violent or extreme)节制，缓和，减轻。

184.[答案]D. model.[详解]model此句中意为“(飞机的)模型”。

183.[答案]C. missed.[详解]miss doing sth.没有做某事：I missed seeing the film when it was shown at school.(学校放映那部电影时，我没有能去看。)