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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 ___________(1) all that with directional(定向的) sound alarms capable of guiding you to the exit.

Sound Alert, a company run _________(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. The alarms produce a _________ (4) range of frequencies that enable the brain to_________ (5) where the sound is coming 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 that people say sounds like static (静电噪音) on the radio," she says. "Its life-saving potential is_________ (7)."

She conducted an experiment in which people were filmed by thermal-imaging (热效应成像) cameras trying to find their _________ (8) out of a large smoke-filled room. It_________ (9) them nearly four minutes to find the door without a sound alarm,_________ (10) 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 (精确地确定) more easily than the source of a narrow band. Alarms _________ (13) on the same concept have already been installed on emergency vehicles.

The alarms will also include rising or falling frequencies to_________ (14) whether people should go up or down stairs. They were_________ (15) 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

第 58 题

A.life

B.way

C.method

D.skill

【正确答案】： B

第 59 题

A.took

B.spent

C.used

D.had

【正确答案】： A

第 60 题

A.but

B.even

C.so

D.if

【正确答案】： A

第 61 题

A.processes

B.produces

C.takes

D.refuses

【正确答案】： A

第 62 题

A.feature

B.quality

C.diagram

D.source

【正确答案】： D

第 63 题

A.accepted

B.based

C.kept

D.focused

【正确答案】： B

第 64 题

A.describe

B.demand

C.consider

D.indicate

【正确答案】： D

第 65 题

A.developed

B.bought

C.discovered

D.sent

【正确答案】： A

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