【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 change all that{{U}} (51) {{/U}}directional sound alarms capable of guiding you to the exit.
SoundAlert, a company{{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、{{U}} (54) {{/U}} produce a wide range of frequencies that enable the brain to determine where the{{U}} (55) {{/U}}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 {{U}} (57) {{/U}}people say sounds like static 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{{U}} (58) {{/U}}room. It{{U}} (59) {{/U}}them nearly four minutes to find the door {{U}} (60) {{/U}}a sound alarm, but 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 more easily than the source of a narrow banD、Alarms{{U}} (63) {{/U}}the same concept have already been installed on emergency vehicles.
The alarms will also include rising or falling frequencies to indicate whether people should go up{{U}} (64) {{/U}}down stairs. They were{{U}} (65) {{/U}}with the aid of a large grant fromBritish Nuclear Fuels.
B．what
C．that
D．how
网考网参考答案：C
网考网解析：
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。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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