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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