下面的短文有 15 处空白，请根据短文内容为每处空白确定 1 个最佳选项。 Singing Alarms Could Save the Blind ...

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问题下面的短文有 15 处空白，请根据短文内容为每处空白确定 1 个最佳选项。 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) alf 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 frequencieis 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. a It is a burst of white noise that people say sounds like static （静电噪声）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. (10)

选项 A but B even C so D if

答案 A

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下面的短文有 15 处空白，请根据短文内容为每处空白确定 1 个最佳选项。 Singing Alarms Could Save the Blind ...

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