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 ___________ all that with directional sound alarms capable of guiding you to the exit.
Sound Alert, a company run _________ the University of Leeds, is installing the alarms in a residential home for _________ people in Sommerset and a resource centre for the blind in Cumbria. The alarms produce a _________ range of frequencies that enable the brain to_________ where the sound is coming from.
Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be_________ by humans. It is a burst of white noise that people say sounds like static on the radio, she says. Its life-saving potential is_________ .
She conducted an experiment in which people were filmed by thermal-imaging cameras trying to find their _________ out of a large smoke-filled room. It_________ them nearly four minutes to find the door without a sound alarm,_________ only 15 seconds with one.
Withington studies how the brain _________ sounds at the university. She says that the _________ of a wide band of frequencies can be pinpointed more easily than the source of a narrow band. Alarms _________ on the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to_________ whether people should go up or down stairs. They were_________ with the aid of a large grant from British Nuclear Fuels.
51.A.change
B.cure
C.demand
D.set
52.A.to
B.along
C.by
D.with
53.A.slow
B.deaf
C.blind
D.lame
54.A.close
B.wide
C.small
D.high
55.A.form
B.affect
C.create
D.determine
56.A.watched
B.made
C.learnt
D.heard
57.A.unlikely
B.uncertain
C.great
D.little
58.A.life
B.way
C.method
D.skill
59.A.took
B.spent
C.used
D.had
60.A.but
B.even
C.so
D.if
61.A.processes
B.produces
C.takes
D.refuses
62.A.feature
B.quality
C.diagram
D.source
63.A.accepted
B.based
C.kept
D.focused
64.A.describe
B.demand
C.consider
D.indicate
65.A.developed
B.bought
C.discovered
D.sent
参考答案：ACCBD DCBAA ADBDA