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在课堂教学中,我们一线教师常常会碰到这样的情况:尽管课前做了大量充分的预设,可课堂上仍然会遭遇“节外生枝”的窘境。这时,教师的教
In classroom teaching, our front-line teachers often encounter such a situation: despite a large number of pre-class pre-set, the classroom may still encounter “exogenous ” dilemma. At this time, teachers teach