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243. The speaker _____ several other subjects in the course of his talk but mostly kept himself to the main topic.

A. held on B. worked out C. touched on D. kept out of

244. Comrade Li Dazhao, _____ librarian of Beijing University , was one of the founders of the Chinese Communist Party.

A. sometimes B. sometime C. some time D. some times

245. Alice was very sorry to hear that her grandmother had _____ two days before.

A. broken off B. passed off

C. given away D. passed away

246. What makes the space shuttle _____ is that it takes off like a rocket but lands like an airplane.

A. exceptional B. strange C. unique D. rare

243. [ 答案 ]C. touched on

[ 注釋 ]touch on 簡(jiǎn)單談到。

244. [ 答案 ]B. sometime.

[ 注釋 ]sometime(=former) 過(guò)去的，以前的： Alice Brown, a sometime pupil of our school, is now a teacher there.

245. [ 答案 ]D. passed away.

[ 注釋 ]pass away(=die) 死亡，是“死亡”的委婉語(yǔ)。

break off 中斷； give away 給掉；泄露； pass off 中止，中斷。

246. [ 答案 ]C. unique.

[ 注釋 ]unique(=being the only one of its type) 同類(lèi)事物中獨(dú)一無(wú)二的。如： This stamp is unique; all others like it have been lost or destroyed.