Singing Alarms

共享题干题                                （一） Singing Alarms Could Save the Blind
     根据材料，回答下列问题。
     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:________(51 ) directional sound alarms capable of guiding you to the exit.
    Sound Alert, a company " :________(52) the University of Leeds, is installing the alarms in a residential home for:________  ( 53 ) people in Sommerset and a resource centre, for the blind in Cumbria. :________ (54 ) produce a wide range of frequencies that enable the brain to determine where the:________( 55 ) is coming from.
    Deborah Withington of Sound Alert says that the alarms use most of the frequencies that can be :________  (56) by humans. "It is a burst Of white noise :________  (57) people say sounds hkestatic 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 of a large:________ (58) room. It :________  (59) them nearly four minutes to find the door:________  (60) a sound alarm, but only 15 seconds with one.   
     Withington studies how the brain:________ (61) sounds at the university. She says that the:________(62) of a wide band of frequencies can be pinpointed mote easily than the source of a narrow band. Alarms:________(63)the same concept have already been installed on emergency vehicles.
    The alarms will also include rising or failing frequencies to indicate whether people should goup:________(64) down stairs. They were :________ ( 65 ) with the aid of a large grant from British Nuclear Fuels.