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 change all that__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 the __5__ 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__7__ people say sounds like static on the radio," he 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 of a large__8__ room. It__9__ them nearly our 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__ on 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 .

　　key: BACDB DCBCC ADDAA