英语阅读理解：光学与声学

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1、英语阅读理解：光学与声学　　Lighttravelsataspeedwhichisaboutamilliontimesfasterthanthespeedofsound.Youcangetsomeideaofthisdifferencebywatchingthestartofarace.Ifyoustandsomedistanceawayfromthestarter,youcanseesmokefromhisgunbeforethesoundreachesyourears.　　Thisgreatspeedoflig

2、htproducessomestrangefacts.Sunlighttakesabout8minutestoreachus.Ifyoulookatthelightofthemoontonight,rememberthatthelightraysleftthemoonsecondsbeforetheyreachedyou.Theneareststarissofarawaythatthelightthatyoucanseefromittonightstartedtotraveltowardsyoufouryearsa

3、goataspeedofnearly2millionkm.perminute.Insomecases,thelightfromoneoftonight’sstarshadstartedonitsjourneytoyoubeforeyouwereborn.　　Thus,ifwewanttobehonest,wecan’tsay,“Thestarsareshiningtonight.”Wehavetosayinstead,“Thestarslookpretty.Theywereshiningfouryearsago,b

4、uttheirlighthasonlyjustreachedtheearth.”　　1.Lightspeedis______soundspeed　　A.asfastasB.amilliontimesslowerthan　　C.aboutmillionsoftimesfasterthanD.aboutamilliontimesfasterthan　　2.Ifyoustand200metresawayfromamanwhoisfiringaguntostartarace,youwillfindoutthat______

5、.　　A.youcanhearthesoundbeforeyouseethesmokeB.thesounddoesnottravelasfastaslight　　C.thesoundwillreachyoubeforethemanfiresD.soundtravelsaboutamilliontimesfasterthanlight　　3.Sunlightobviously______thanthelightofthemoon　　A.hastotravelagreaterdistanceB.moveslessqui

6、ckly　　C.travelsmuchmorequicklyD.islesspowerful　　4.Thescientificwayofsaying“Thestarsareshiningtonight”shouldbe______.　　A.thestarshavebeenshiningallthetimeB.thestarsseentonightwillshinefouryearslater　　C.thestarswereshininglongagobutseentonightD.thestarlightseent

7、odaycouldbeseenfouryearsago　　1.D事实细节题。由第1段第1句可知。　　2.B推理判断题。由第1段最后一句推出。　　3.A推理判断题。由第2段的第2句和第3句可推出。　　4.C推理判断题。由最后一段的最后一句Theywereshiningfouryearsago,buttheirlighthasonlyjustreachedtheearth可推出。