262.[答案]D. consultation.[详解]consultation商议：hold a consultation with sb. about sth.(与某人商谈某事)。conference讨论会;participation参加，参与;intervention干预，干涉。

261.[答案]D. consistent.[详解]consistent 1)始终如一，前后一致：He is not consistent in his statements.(他的话并不前后一致。) 2)与......一致：The story is not consistent with the facts. What you say is not consistent with what you do.

260.[答案]A. broken through.[详解]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.[答案]D. chance.[详解]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.[答案]C. advantage.[详解]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.[答案]D. expression.[详解]expression此处意指“表情”。Appearance表示人的“仪表，外表”。

256.[答案]D. spoiled.[详解]spoiled使......扫兴: A shower of rain spoiled our day's outing.

255.[答案]A. pieced together.

　[详解]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.[答案]D. emission.[详解]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.[答案]D. scarcely.[详解]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。