When performing on the "no" and "no" in the task of teaching, but also on new knowledge and old knowledge mastery, with China, it is the old saying, "Reviewing the Old", if the syntax used in the past to take once learned to ignore the attitude, it will soon forget the old knowledge, and knowledge is easy with the new mixed together, resulting in the use of knowledge between the chaos, the situation in the "no" and "no." These similar knowledge learning process especially prone, students and teachers need to have enough attention.
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