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课本习题一般都具有基础性、典型性的特点.在教学中,如果能针对原题进行适当延伸或演变,就能发挥课本习题的潜在功能,提高学生
Textbook exercises usually have basic and typical characteristics. In teaching, if the original questions can be appropriately extended or evolved, the potential functions of textbook exercises can be brought into play and students can be improved.