應(yīng)老師，謝謝您小學(xué)作文（通用16篇）

　　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.

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