Singing Alarms Could Save the Blind
) h3 ^* q8 D4 H9 ? 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. + [' s7 e: n" Z9 b1 ~" E, v
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.
6 c- P5 K. ]# h& E) F 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)." 2 u" c }. [% _
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.
4 r: z# W9 T- Z- ]- U 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. ) ]4 K2 o- w2 z0 _- p4 Z
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. $ v- V+ u' K+ Q. c1 ^# R
1 A change B cure C demand D set - ]' W1 r5 w, j! B9 P, F M
2 A to B along C by D with
4 w8 g1 M) Q1 k% s- I v 3 A slow B deaf C blind D lame
9 d( t0 ^ i2 J2 M" l+ l 4 A close B wide C small D high
8 `" Y* j5 d Y6 W1 C' _ 5 A form B affect C create D determine 8 f+ [: g$ N# N, r# X7 R6 h
6 A watched B made C learnt D heard 1 x! J6 X. E% z" D' G0 Z! Q/ w
7 A unlikely B uncertain C great D little
* Q: N3 k4 l A& I+ u 8 A life B way C method D skill
' M% d% G; I3 J7 S 9 A took B spent C used D had 8 b J1 [" K! A' m8 y, `$ i% u
10 A but B even C so D if
8 n9 A& P x0 _; m$ K P/ i7 Y) K 11 A processes B produces C takes D refuses
8 H, K* P7 `3 P4 @1 U1 E5 R 12 A feature B quality C diagram D source ' | Y( h$ h$ P
13 A accepted B based C kept D focused 4 S1 g+ t; ]% o. R+ X/ j
14 A describe B demand C consider D indicate $ {* |4 s8 g' l7 F7 |- m8 \
15 A developed B bought C discovered D sent
4 ?4 a, g8 }0 ~; F! L 【参考答案】
L) ?) ?4 ~# u& M1 A: B9 z 1. A 2. C 3. C 4. B 5. D
2 y" P5 Z( K$ c4 z* O 6. D 7. C 8. B 9. A 10. A
9 p+ B# {$ T4 r c, J8 J, Q+ O 11. A 12. D 13. B 14. D 15. A |