260. Scientists think they have _____ in their attempt to find the causes of some major dieases.

　 A. broken through　　 B. worked out

　 C. fallen out　　　　 D. got round

[答案]A. broken through.

[注释]break through(=be successful after overcoming a difficulty)突破；取得重大成果：Scientists hope to break through soon in their fight against heart disease.(科学家希望在与心脏病斗争中很快取得重大成果。)

本题译文：科学家认为他们在探索某些重要疾病的病因中已取得重大突破。

259. If you ever have the _____ to go abroad to work, you should take it.

A. possibility　　 B. offer　　 C. luck　 D. chance

[答案]D. chance.

[注释]chance(偶然的)机会。Have与the(或 a) possibility不能搭配；常用There is a possibility for sb. to do sth.表示客观存在的“可能性”。

258. I'd like to take _____ of this opportunity to thank you all for your cooperation.

A. profit　 B. benefit　 C. advantage　 D. interests

[答案]C. advantage.

[注释]take advantage of(=make use of sth. for one's own benefit)利用：take advantage of my ignorance(利用我的无知)。

257. I could tell he was surprised from the _____ on his face.

A. appearance　　 B. view　　 C. sight　　 D. expression

[答案]D. expression.

[注释]expression此处意指“表情”。Appearance表示人的“仪表，外表”。

256. We had a marvelous holiday: only the last two days were slightly _____ by the weather.

　 A. damaged　　 B. hurt　　 C. ruined　　 D. spoiled

[答案]D. spoiled.

[注释]spoiled使......扫兴: A shower of rain spoiled our day's outing.

255. The book seems to have been _____ from various books and articles.

　 A. pieced together　　 B. taken off

　 C. broken away　　　　 D. pulled out

[答案]A. pieced together.

[注释]piece together拼合，拼凑；take off起飞；break away from脱离；pull out拔出；驶出；(车)减速。

254. As more and more cars are produced and used, so the _____ from their exhaust-pipes contains an even larger volume of poisonous gas.

A. exposure　 B. distribution　 C. expansion　 D. emission

[答案]D. emission.

[注释]emission散发物，发射。exposure(to)暴露于：They believe that their health problems are the result of years of exposure to fine cotton dust.(他们认为，他们的健康问题是多年来暴露于棉花粉尘所致。)expansion膨胀，扩大；Heat causes the expansion of gas.本题译文：正如汽车的生产和使用越来越多一样，汽车的排气管的散发物内所含的有毒气体量也在增加。

253. He left in such a hurry that I _____ had time to thank him.

A. almost　　 B. even　　 C. nearly　　 D. scarcely

[答案]D. scarcely.

[注释]scarcely(=hardly, not quite, almost not)几乎没有。Scarcely是否定副词，类似的有：hardly, barely, rarely, seldom, little等。研究生入学考试中经常测试这类否定副词的用法。

252. There are usually at least two _____ of looking at every question.

A. ways　　 B. directions　　 C. views　　 D. opinions

[答案]A. ways.

[注释]two ways of looking at every questions意指“观察每个问题的两个方面”。

251. It is not profitable to provide bus services in districts where the population is widely _____.

A. scattered　 B. dismissed　 C. separated　 D. spread

[答案]A. scattered.

[注释]scattered是scatter的过去分词，也可作形容词用，(=lying in different directions; not situated together, wide apart)分散的，散布在各处的。Separate分开的，spread传播；摊开，dismiss解雇。