B

　　Laboratoryworkisyourchancetolearnsciencefirsthand.Itcanbefunbutyoumustbecarefultopreventinjury.Listencloselywhenyourteacherreadsandexplainstherulesbeforeyourfirstlablesson.

　　61.Yourteacherwillprobablytellyoutherulesabove______thefirstlablesson.

　　A.beforeB.sinceC.duringD.after

　　62.Beforeeveryexperiment,youshould___.

　　A.tastethechemicalsfirstB.cleanalltheapparatus

　　C.readallinstructionscarefullyD.reportalltheaccidentstotheteacher

　　63.Whenyouarenotsurehowtouseallapparatus,____.

　　A.trythemonyourownB.readtherulescarefully

　　C.askyourteacherforhelpD.putthemback

　　64.Itisclearthatyoucan____.

　　A.bringfoodintothelabB.cleanthelabanytime

　　C.smellchemicalsasyoulike

　　D.learnsciencedirectlyinthelab

　　65.Ifyougetchemicalsontheclothing,youcanfindwaystosolveitinthepart____.

　　A.BeforetheExperimentB.FirstAid

　　C.DuringtheExperimentD.AftertheExperiment