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.
第 51 题
A.change
B.cure
C.demand
D.set
【正确答案】： A
第 52 题
A.to
B.along
C.by
D.with
【正确答案】： C
第 53 题
A.slow
B.deaf
C.blind
D.lame
【正确答案】： C
第 54 题
A.close
B.wide
C.small
D.high
【正确答案】： B
第 55 题
A.form
B.affect
C.create
D.determine
【正确答案】： D
第 56 题
A.watched
B.made
C.learnt
D.heard
【正确答案】： D
第 57 题
A.unlikely
B.uncertain
C.great
D.little
【正确答案】： C