《课程标准》向我们指出:“教师不要把上下课的铃声当作教学的起点和终点,学生的探究活动往往不是一节课所能完成的。教师要重视引导学生在课后开展后继活动。”这一观点已经被广大教师认同。因而许多教师经常在课后设计拓展 “Course Standards” pointed out to us: “Teachers should not regard ringing and ringing as the starting point and end point of teaching. Students’ inquiry activities are often not completed by a single class. Teachers should pay attention to guiding students to carry out follow-up activities after class. ”This view has been recognized by the majority of teachers. So many teachers often design and expand after class