262. The new safety regulations were agreed on after _____ with the work-force.

　A. conference B. participation C. intervention D. consultation

261. His test results are not very _____. He does well one week and badly the next.

　A. invariable B. consequent C. continuous D. consistent

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

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

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

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

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

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

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

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

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

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

　A. pieced together B. taken off C. broken away D. pulled out

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

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

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