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。

250. He _____ the place where he had been bitten by an insect.

   A. snatched    B. scratched    C. squeezed    D. stretched

[答案]B. scratched.

[注释]scratch抓，搔。此外，有一常用习语：scratch one's head over sth.对某事迷惑不解，搔头皮。

Snatch掠夺；stretch拉长，延伸，撑大；squeeze压榨，挤。

249. Trains stop here in order to _____ passengers only.

   A. get off    B. pick up    C. pull up    D. pull in

[答案]B. pick up

[注释]pick up passages(接运旅客上车。)

pull in(火车)进站；（船）靠岸；pull up停车；get off下车。

248. This album is _____ as it was the only one ever signed by the President.

   A. unusual    B. unique    C. rare    D. special

[答案]B. unique。

[注释]unique(某一类中)独一无二的。如选unusual(不寻常的，独特的)，虽然也说得过去，但毫无疑问，unique是最佳选择，因为它的后面the only one相呼应。Special专门的，专用的，例如；They went to London on a special train.[他们搭一班专车（或加班车）去伦敦。]rare稀有的，罕见的，如：rare metals(稀有的金属)。Singular单数的。

247. In aerospace devices the weight of the necessary power producing equipment is _____.

   A. vital    B. possible    C. capable    D. reliable

[答案]A. vital。

[注释]vital 极其重要的。本题译文：在航空航天装置中必要的动力设备的重量问题是至关紧要的。

246. There was a good _____ of the countryside from the front of the bus.

   A. sight    B. view    C. scene    D. scenery

[答案]B. view。

[注释]view在本句中意指"看，眺望"，如：It is a large room with a view of the doctor's well-kept garden. (这是一间大房间，从房间里能看到医生精心管理的花园。)本题译文：坐在汽车的前排座位可以清楚地看到乡间的景色。

245. And you find that you're not to be _____ with a position of real responsibility.

   A. offered    B. trusted    C. furnished    D. retained

[答案]B. trusted。

[注释]trust sb. with sth. 把某事托付给某人：I can't trust him with my car.(我不能把我的车托付给他。)本题译文：你认为不会把真正有责任的工作托付给你。