完形填空。Theworld1manyinterestingsounds.Someareunpleasanttoourearswhile2areverypleasanttohear.Inasingledayyouprobablyhear3sounds.Allsoundsaredifferent.Some4loud,somesou
完形填空。
Theworld 1 manyinterestingsounds.Someareunpleasanttoourearswhile 2 areverypleasant
tohear.Inasingledayyouprobablyhear 3 sounds.Allsoundsaredifferent.Some 4 loud,some
soundsarehigh,othersarelow,somesoundsareuseful. 5 soundwecannottalkorlistentoeachother.
Theringingofthealarmclockwakespeopleup;thehootingofacarwarnspeopleofdanger.
Somesoundsareharmful.Whenplanesflylow 6 theland.Theveryloudsoundscandamagethehouse.
Veryloudsoundcanevenmakepeopledeaf.Weknowsoundtravelsaboutonekilometerinthree 7 .Ina
thunderstormyouseethelightingfirstandthenhearthethunder.
Thisisbecauselighttravels_8_thansound.Nexttimeyouseelightning,countthenumberofseconds
beforeyouhearthethunder.
Dividethisnumber 9 3. Thiswilltellyou 10 kilometersawaythethunderstormis.
( )1. A.fullof
( )2. A.others
( )3. A.hundredsof
( )4. A.may
( )5. A.of
( )6. A.in
( )7. A.hours
( )8. A.morefast
( )9. A.in
( )10. A.howmach B.fillwith
B.theother
B.hundredof
B.Maybe
B.with
B.on
B.days
B.muchfaster
B.of
B.howmany C.isfilledof
C.another
C.Hundreds
C.maybe
C.without
C.above
C.minutes
C.morefaster
C.by
C.how D.isfilledwith
D.theothers
D.hundred
D.can
D.By
D.over
D.seconds(秒)
D.muchfaster
D.at
D.howlong