职称英语a级有效期-2017职称英语理工类A级完形填空精选练习题（四）

If you cannot see,you may not be able to1 find your way out of a burning building — and that could be fatal.A company in Leeds could change all that2____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 where the____5____ is coining 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," 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 of3 a large____8____ room.It____9____ them nearly four 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____ 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

　　参考答案：

　　1.B 　　2.A 　　3.C 　　4.D　　5.B

　　6.D 　　7.C 　　8.B 　　9.C 　　10.C

　　11.A 　　12.D 　　13.D　　14.A 　15.A

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