【单选题】
阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从 4个选项中选择1个最佳答案。
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 {{U}} (51) {{/U}} all that with directional (定向的) sound alarms capable of guiding you to the exit.
SoundAlert, a company run {{U}} (52) {{/U}} the University of Leeds, is installing the alarms in a residential home for {{U}} (53) {{/U}} people in Sommerset and a resource centre for the blind inCumbriA、The alarms produce a {{U}} (54) {{/U}} range of frequencies that enable the brain to {{U}} (55) {{/U}} where the sound is coming from.
Deborah Withington of SoundAlert says that the alarms use most of the frequencies that can be {{U}} (56) {{/U}} by humans. "It is a burst of white noise that people say sounds like static (静电噪音) on the radio," she says. "its life-saving potential is {{U}} (57) {{/U}}."
She conducted an experiment in which people were filmed by thermal-imaging (热效应成像) cameras trying to find their {{U}} (58) {{/U}} out of a large smoke-filled room. It {{U}} (59) {{/U}} them nearly four minutes to find the door without a sound alarm, {{U}} (60) {{/U}} only 15 seconds with one.
Withington studies how the brain {{U}} (61) {{/U}} sounds at the university. She says that the {{U}} (62) {{/U}} of a wide band of frequencies can be pinpointed (精确地确定) more easily than the source of a narrow banD、Alarms {{U}} (63) {{/U}} on the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to {{U}} (64) {{/U}} whether people should go up or down stairs. They were {{U}} (65) {{/U}} with the aid of a large grant fromBritish Nuclear Fuels.
B．along
C．by
D．with
网考网参考答案：C
网考网解析：
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