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  3. 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 th

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 th

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问题                         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【C1】______directional sound alarmscapable of guiding you to the exit.
    Sound Alert,a compa【C2】______the University of Leeds, is installing the alarms in aresidential home for【C3】______people in Sommerset and a resource centre for the blind in Cumbria.【C4】______produce a wide range of frequencies that enable the brain to determine where the【C5】______is coming from.
    Deborah Withington of Sound Alert says that the alarms use most of the frequencies that canbe【C6】______by humans. "It is a burst of white noise【C7】______people say sounds likestatic on the radio," she says. " Its life-saving potential is great. "
    She conducted an experiment in which people were filmed by thermal-imaging cameras tryingto find their way out of a large【C8】______ room. It【C9】______them nearly four minutesto find the door【C10】______a sound alarm, but only 15 seconds with one.
    Withington studies how the brain【C11】______ sounds at the university. She says that the【C12】______ of a wide band of frequencies can be pinpointed more easily than the source of anarrow band. Alarms【C13】______the same concept have already been installed on emergency vehicles.
    The alarms will also include rising or falling frequencies to indicate whether people should goup【C14】______ down stairs. They were【C15】______ with the aid of a large grant from BritishNuclear Fuels.
【C7】
选项 A、where
B、what
C、that
D、how
答案C
解析 选择A、B、D均不能构成语义连贯的句子,而且语法上也有问题。选项C能使句子结构成为“It is…that”的强调句型。
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