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

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

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

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

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

　A. sight B. view C. scene D. scenery

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

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

244. They decided to leave the waiter a big _____ because the food and service had been excellent.

　A. note B. reward C. tip D. gift

243. The patients believe that the doctor knows exactly how to put them _____.

　A. correct B. perfect C. right D. well

242. Stressful environments lead to unhealthy behaviors such as poor eating habits, which _____ increase the risk of heart disease.

　A. in turn B. in return C. by chance D. by turns

241. Circus tigers, although they have been tamed, can _____ attack their trainer.

　A. unexpectedly B. deliberately C. reluctantly D. subsequently

240. The _____ of his clothes indicated too clearly that he had been playing football.

　A. state B. condition C. occasion D. situation

239. When the entire class worked together they finished the project _____.

　A. in no way B. in no time C. on no account D. in no case