每日一练：职称英语理工类每日一练(2014-11-17)
Singing Alarms Could Save the Blind
If you cannot see,you may not be able to1 find your way out of a burning building — and that could befatal. A company in Leeds could change all that2____1____ directional soundalarms capable of guiding you to the exit.
Sound Alert, acompany____2____ the University of Leeds, is installing the alarms in aresidential home for____3____ people in Sommerset and a resource centre for theblind in Cumbria.____4____ produce a wide range of frequencies that enable thebrain to determine where the____5____ is coining from.
Deborah Withington ofSound Alert says that the alarms use most of the frequencies that canbe____6____ by humans. “It is a burst of white noise____7____ people saysounds like static on the radio，” she says. “Its life-saving potential is great.”
She conducted anexperiment in which people were filmed by thermal-imaging cameras trying tofind their way out of3 a large____8____ room. It____9____ them nearly fourminutes to find the door____10____ a sound alarm, but only 15 seconds with one.
Withington studieshow 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 ofa narrow band. Alarms____13____ the same concept have already been installed onemergency vehicles.
The alarms will alsoinclude rising or falling frequencies to indicate whether people should goup____14____ down stairs. They were____15____ with the aid of a large grantfrom British Nuclear Fuels.
1.A withoutB with C having D selling
2.A run by B changedby C decorated by D criticized by
3.A slow B deafC blind D lame
4.A Alarms B AlarmC The alarm D The alarms
5.A noise B soundC music D bell
6.A watched B producedC learnt D heard
7.A where B whatC that D how
8.A smoked B smoke-filledC filled with smoke D smoke-filling
9.A has taken B takesC took D will take
10.A on B nearC without D from
11.A processes B producesC possesses D proceeds
12.A feature B qualityC diagram D source
13.A basis on B baseon C basing on D based on
14.A or B andC but D otherwise
15.A developed B determinedC discovered D delivered
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