...教学目标层次化；分层授课；分类指导；分层练习 [gap=384]Key words】Hierarchical group teaching;Teaching objectives hierarchical;Layered medium of instruction;Classification guidance;Stratified practice ..
Intheoryteaching, turn teaching contentintodifferent levels and operationalobjectivesthroughtherationaldesign, and setrelevantquestionsto facilitatestudentsunderstanding.