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　　下面的短文有l5处空白，请根据短文内容为每处空白确定l个最佳选项。

　　51、根据材料，回答51-65题。

　　Singing Alarms Could Save the Blind

　　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_________ (51 ) directional sound alarms capable of guiding you to the exit.

　　Sound Alert, a company " _________ (52) the University of Leeds, is installing the alarms in a residential home for_________ ( 53 ) people in Sommerset and a resource centre, for the blind in Cumbria. _________ (52 ) produce a wide range of frequencies that enable the brain to determine where the_________ ( 55 ) is coming from.

　　Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be _________ (56) by humans. "It is a burst Of white noise _________ (57) people say sounds hkestatic on the radio," she 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_________ (58) room. It _________ (59) them nearly four minutes to find the door_________ (60) a sound alarm, but only 15 seconds with one.

　　Withington studies how the brain _________ (61) sounds at the university. She says that the_________ (62) of a wide band of frequencies can be pinpointed mote easily than the source of a

　　narrow band. Alarms_________ (63)the same concept have already been installed on emergency vehicles.

　　The alarms will also include rising or failing frequencies to indicate whether people should goup_________ (64) down stairs. They were _________ ( 65 ) with the aid of a large grant from British

　　Nuclear Fuels.

　　回答(51)题

　　A.without

　　B.with

　　C.having

　　D.selling

　　52、 回答(52)题

　　A.run by

　　B.changed by

　　C.decorated by

　　D.criticized by

　　53、 回答(53)题

　　A.slow

　　B.deaf

　　C.blinD

　　D.lame

　　54、 回答(54)题

　　A.Alarms

　　B.Alarm

　　C.The alarm

　　D.The alarms

　　55、 回答(55)题

　　A.noise

　　B.sounD

　　C.musiC

　　D.bell

　　56、 回答(56)题

　　A.watcheD

　　B.produceD

　　C.learnt

　　D.heard

　　57、 回答(57)题

　　A.where

　　B.what

　　C.that

　　D.how

　　58、 回答(58)题

　　A.smokeD

　　B.smoke-filleD

　　C.filled with smoke

　　D.smoke-filling

　　59、 回答(59)题

　　A.has taken

　　B.takes

　　C.took

　　D.will take

　　60、 回答(60)题

　　A.with

　　B.at

　　C.without

　　D.over

　　61、回答(61)题

　　A.processes

　　B.produces

　　C.possesses

　　D.proceeds

　　62、 回答(62)题

　　A.feature

　　B.quality

　　C.diagram

　　D.source

　　63、 回答(63)题

　　A.basis on

　　B.base on

　　C.basing on

　　D.based on

　　64、 回答(64 )题

　　A.or

　　B.anD

　　C.but

　　D.otherwise

　　65、 回答(65 )题

　　A.developeD

　　B.determineD

　　C.discovereD

　　D.delivered

 

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