职称英语完型填空专项练习题
If you cannot see, you may not be able to find your way out of a burning building-and that could be fatal. A company in Leeds could change all that__1__ directional sound alarms capable of guiding you to the exit.
Sound Alert, a company__2__ the University of Leeds, is installing the alarms in a residential home for__3__ people in Sommerset and a resource centre for the blind in Cumbria.__4__produce a wide range of frequencies that enable the brain to determine the __5__ is coming from.
Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be __6__ by humans. "It is a burst of white noise__7__ people say sounds like static on the radio," he says. "Its life-saving potential is great"She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their way out of a large__8__ room. It__9__ them nearly our minutes to find the door__10__ a sound alarm, but only 15 seconds with one.
Withington studies how the brain__11__ sounds at the university. She says that the __12__ of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms__13__ on the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to indicate whether people should go up__14__ down stairs. They were__15__ with the aid of a large grant from British Nuclear Fuels.
1. A) without B)with C)having D)selling .
2. A) run by B)changed by C) decorated by D)criticized by .
3. A) slow B)deaf C)blind D)lame.
4. A) Alarms B) Alarm C) The alarm D) The alarms.
5. A) noise B) sound C) music D) bell .
6. A) watched B) produced C) learnt D) heard .
7. A) where B) what C) that D) how.
8. A) smoked B) smoke-filled C) filled with smoke D) smoke-filling .
9. A) has taken B) takes C) took D) will take.
10. A) on B) near C) without D) from.
11. A) processes B) produces C) possesses D) proceeds .
12. A) feature B) quality C)diagram D) source .
13. A) basis on B) base on C) basing on D) based on .
14. A) or B) and C) but D) otherwise .
15. A) developed B) determined C) discovered D) delivered .
答案：1~5 BACDB 6~10 DCBCC 11~15 ADDAA
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