Singing Alarms Could Save the Blind
9 E# e u2 i# C# M7 Z 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. . w( p. v( s2 C3 Y2 V: g Q: [; _
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. # g$ r- ^6 O* E J( X2 [2 R
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)." - O3 ]+ V |5 x$ T/ p$ ^
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.
; f3 A3 A+ q3 d- c4 U' W% ?* H4 a 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.
& B( d6 D+ R/ @ 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. , Q Z( f# V& f9 }8 z6 N
1 A change B cure C demand D set ' N- u; ^2 S* Z
2 A to B along C by D with * D# W% U' f3 d4 l9 ]; L
3 A slow B deaf C blind D lame
* P5 k% R; \* Z _- k 4 A close B wide C small D high - W: H3 y6 n; D$ e+ Y2 f$ _1 S
5 A form B affect C create D determine
9 }6 Q/ x# P3 J 6 A watched B made C learnt D heard 7 f8 B( U- w e% R
7 A unlikely B uncertain C great D little 5 }8 ?3 {7 q/ T% s4 v6 {* z- L
8 A life B way C method D skill * T+ p3 N" Y9 I
9 A took B spent C used D had
0 G: g6 H% c7 s* F 10 A but B even C so D if $ Q+ s. g- f" P( \( O1 U2 [+ ?
11 A processes B produces C takes D refuses
" t8 Q2 s, i2 T# C+ y; \ 12 A feature B quality C diagram D source
; T3 x" s9 f5 @4 \# m; O) o 13 A accepted B based C kept D focused 9 s7 h, q/ s. q3 V$ M
14 A describe B demand C consider D indicate % k0 {6 g8 S) b6 U/ i
15 A developed B bought C discovered D sent : O" x7 ]3 x) O4 ?, q: q
【参考答案】4 E b2 ?6 A. |: q; F
1. A 2. C 3. C 4. B 5. D# S# K/ i1 b9 \/ P8 N Q, f
6. D 7. C 8. B 9. A 10. A- G! u2 C9 U0 i6 x o
11. A 12. D 13. B 14. D 15. A |