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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)、All 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 frequencies 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. "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 　(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.

1、A change B cure C demand D set

2、A to B、Along C by D with

3、A slow B deaf C blind D lame

4、A close B wide C small D high

5、A form B、Affect C create D determine

6、A watched B made C learnt D heard

7、A unlikely B uncertain C great D little

8、A life B way C method D skill

9、A took B spent C used D had

10、A but B even C so D if

11、A processes B produces C takes D refuses

12、A feature B quality C diagram D source

13、A、Accepted B based C kept D focused

14、A describe B demand C consider D indicate

15、A developed B bought C discovered D sent

【参考答案】

1.、A2. C3. C4. B5. D 6. D7. C8. B9.A10.A 11.A 12. D 13. B 14. D 15.A