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If you cannot see, you may not be able to1 find your way out of a burning buildingand that could be fatal. A company in Leeds could change all that2_____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 center for the blind in Cumbria._____4______ produce a wide range of frequencies that enable the brain to determine where 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白噪音：音响或电力嗓音 ____7____ people say sounds like static静电噪声 on the radio, she 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 of3 a large ____8___ room. It ____9____them nearly four 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 波段of frequencies can be pinpointed 极微小的more easily than the source of a narrow band. Alarms _____13_____ the same concept have already been installed on emergency vehicles. | 
