48.Accordingtothepassage,passivelearningmayoccurin_______.

　　A.doingamedicalexperimentB.solvingamathproblem

　　C.visitinganexhibitionD.doingscientificreasoning

　　49.Theunderlinedword“it”inParagraph2refersto_____.

　　A.activelearningB.knowledge

　　C.communicationD.passivelearning

　　50.TheauthormentionsthegameRumortoshowthat_____.

　　A.amessagemaybechangedwhenbeingpassedon

　　B.amessageshouldbedeliveredindifferentways

　　C.peoplemayhaveproblemswiththeirsenseofhearing

　　D.peopletendnottobelieveinwhattheyknowasrumor

　　51.Whatcanweinferfromthepassage?

　　A.Activelearningislessimportant.B.Passivelearningmaynotbereliable.

　　C.Activelearningoccursmorefrequently.D.Passivelearningisnotfoundamongscholars.

　　答案48.C49.D50.A51.B