题目内容：
Questionsarebasedonthefollowingpassage.
Howusefularetheviewsofpublicschoolstudentsabouttheirteachers?
Quiteuseful,accordingtopreliminaryresultsreleasedonFridayfromaresearchprojectthatisintendedtofindnewwaysofdistinguishinggoodteachersfrombad.
Teacherswhosestudentsdescribedthemasskillfulatmaintainingclassroomorder,atfocusingtheirinstructionandathelpingtheirchargeslearnfromtheirmistakesareoftenthesameteacherswhosestudentslearnthemostinthecourseofayear,asmeasuredbygainsonstandardizedtestscores,accordingtoaprogressreportontheresearch.
FinancedbytheBillandMelindaGatesFoundation,thetwo-yearprojectinvolvesscoresofsocialscientistsandsome3,000teachersandtheirstudentsindistrictssuchasNewYorkandPittsburgh.
Statisticiansbegantheeffortlastyearbyrankingalltheteachersusingastatisticalmethodknownasvalue-addedmodeling,whichcalculateshowmucheachteacherhashelpedstudentslearnbasedonchangesintestscoresfromyeartoyear.
Thousandsofstudentshavefilledoutconfidentialquestionnaires(秘密调查问卷)aboutthelearningenvironmentthattheirteacherscreate.Aftercomparingthestudents'rat-ingswithteachers'value-addedscores,researchershaveconcludedthatthereisquiteabitofagreement.
Classroomswhereamajorityofstudentssaidtheyagreedwiththestatement,"Ourclassstaysbusyanddoesn'twastetime,"tendedtobeledbyteacherswithhighvalue-addedscores,thereportsaid.
Thesamewastrueforteacherswhosestudentsagreedwiththestatement,"Inthisclass,weleamtocorrectourmistakes."
Fewofthenation's15,000publicschooldistrictssystematicallyquestionstudentsabouttheirclassroomexperiences,incontrasttoAmericancolleges,manyofwhichcollectan-nualstudentevaluationstoimproveinstruction,DrFergusonsaid.
Untilrecently,teacherevaluationswerelittlemorethanaformality(形式)inmostschoolsystems,withthevastmajorityofinstructorsgettingtopratings,oftenbasedonaprincipal'ssuperficialimpressions.
Butnowsome20statesareoverhaulingtheirevaluationsystems,andmanypolicymak-ershavebeenaskingtheGatesFoundationforsuggestionsonwhatmeasuresofteacheref-fectivenesstouse,saidVickiL.Phillips,adirectorofeducationatthefoundation.
Onenotableearlyfinding,MsPhillipssaid,isthatteacherswhoincessantly(不停地)drilltheirstudentstoprepareforstandardisedteststendtohavelowervalue-addedlearn-inggainsthanthosewhosimplyworktheirwaymethodicallythroughthekeyconceptsofliteracyandmathematics.
Whatissaidaboutteachersratedasgoodatkeepingtheirclassesinorder? A．Theirstudentsgainmoreintestscores.
B．Theirclassesstaybusyanddon'twastetime.
C．Theirstudentslearnfastestduringasemester.
D．Theyhelpstudentslearntocorrecttheirmistakes.
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