______aimstohelpstudentstopayattentiontoteachingcontentsefficientlyatthebeginningoftheclass.
A.Lead-in B.Presentation C.Preparation D.Practice正确答案A
______aimstohelpstudentstopayattentiontoteachingcontentsefficientlyatthebeginningoftheclass.
A.Lead-in B.Presentation C.Preparation D.Practice正确答案A