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2. They use computers to keep the traffic ________ smoothly.

A. being run             B. run                       C. to run                   D. running

【解析】D。此題考查keep…doing sth結(jié)構(gòu)，其意為“保持……做某事”“使……不停地做某事”。又如：He kept the fire burning. 他讓火燃著。I’m sorry to have kept you waiting. 對(duì)不起讓你等了。

3. There is a great deal of evidence ________ that music activities engage different parts of the brain.

A. indicate                B. indicating             C. to indicate            D. to be indicating

【解析】B。從語法上看，“there be+名詞”后面既可接不定式，也可接現(xiàn)在分詞，其區(qū)別是：用不定式表示將要發(fā)生的情況，和現(xiàn)在分詞表示正在進(jìn)行的情況或通常性情況。根據(jù)句意，顯然應(yīng)用現(xiàn)在分詞。句意為：有大量證據(jù)表明音樂活動(dòng)與大腦的不同部位有密切關(guān)系。

4. A small plane crashed into a hillside five miles east of the city, ________all four people on board.

A. killed                   B. killing                  C. kills                     D. to kill

【解析】B�，F(xiàn)在分詞短語killing all four people on board在此用作結(jié)果狀語。又如：He fired, killing one of the passers-by. 他開槍了，打死了一個(gè)過路人。I fell, striking my head against the door and cutting it. 我摔了個(gè)跟頭，頭撞在了門上，劃了個(gè)口子。

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