问题 问答题

画出图中发生的所有反射和折射光线(注意标明法线):

答案

(1)根据光的反射定律,在界面发生反射时,反射角等于入射角,在同种介质中法线的另一侧,作出反射光线并且标出反射光线的方向.

(2)根据光的折射定律,因为光线是从空气斜射入玻璃时,折射角小于入射角,在法线的另一侧,作出折射光线并且标出折射光线的方向.

(3)重复(1)(2)的操作.

 如图所示:

阅读理解

TheUnitedStateshasaround475,000schoolbuses.Eachdaytheycarrymorethan25million children,halfofalltheschoolchildreninthecountry.

Thesebuses,onaverage,use4litersofdiesel(柴油)fueltotravellessthan16kilometers. When theschoolyearbeganlastfall,dieselaveraged55centsaliternationally.Thepricenearlydoubledby theendofschool inJune.

BobRileyisthespokesmanfortheAmericanSchoolBusCouncil.Hesaysfuelpricesnegotiated(商议) for schools arenot lower thanothers have to pay. Asaresult,schoolsarelookingfor waystoreducetransportationcosts.Busroutesarebeing redrawnor,insomecases,canceled.Someareas arebuyingbusesthatuse naturalgas orother alternativefuels.

Otherstepsincludefewerfieldtrips andlesstravel bysports teams.Someschool districtsmayend any busservicenotrequiredby law.

Studiesshowthatschoolbusesarethesafestform oftransportationtoandfrom school.

The AmericanSchoolBus Councilsayscutsinbus serviceare badfor childrenandpossiblythe environment.Itsaysremovingbusesfromtheroadwillmeananincreaseinothervehiclestransporting students. Spokesman Bob Riley saysanotherconcern is thatreducing  busservicemightreduce attendance.

It couldalso getmorechildren to walkor bicycle to school.That wouldsurely makepeople happy attheNationalCenterforSafeRoutestoSchool.Morekidswalkingorbikingsafelytoschoolisthe aimofa3-year-oldfederal program,partofaninternationalmovement.Thegoalis toincreasephysical activity and reduce air pollution.

小题1:Inthesecondparagraph,theauthorwantsto provethat   .

A.toomany schoolchildren takebuses every day

B.thecost offuelhasincreased

C.theschoolbusesconsumemorefuelthanaverage

D.the school busesusuallygoon long routes小题2:Inthe thirdparagraph,what doesBobRiley mean'?

A.Thefuel pricesforschool busesneed to be negotiated again.

B.High fuelprices are also affecting the efficiency of their services.

C.The fuelprices for school are much higher thanothers pay.

D.TheAmericanSchool BusCouncilshould workforstudents’benefit.小题3:Whatistheadvantage ofreducingschoolbusserviceaccordingto thepassage?

A.Morefuelwillbesaved.

B.Studentscangotoschool inasaferway.

C.Studentscanexercisebywalkingorriding toschool.

D.Trafficjams willbereducedduringrushhour.小题4:Whatisthesixth paragraphmainly about?

A.Bob Riley's concern about the resultsof reducing school buses.

B.Theconvenience brought by school buses.

C.Thebad effectsofreducingschool buses.

D.Thestudiesabout students'choicescarried out by theAmericanSchool BusCouncil.

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