现象一:很多学生书上的概念定理背得滚瓜烂熟,但要求用自己的话复述的时候,却支支吾吾不知如何表达,运用定理做简单的习题时也不知如何下手。现象二:每当考试后总有很多学生抱怨又因为粗心看错题,导致错了很多不该错的题,甚至有些字数较多的题目看都没有看懂。现象三:有些学生在开始的时候只要保证上课认真听讲就能成绩不错;到了后来,尽管上课同样认真,但仍止不住成绩不断下滑,听不懂的越来越多。这些究竟是为什么呢? Phenomenon one: Many students book on the concept of theorem back cumbersome, but asked to repeat in their own words, but I do not know how to express, the use of theorem to do simple exercises do not know how to start. Phenomenon 2: Every time after the exam there are always many students complain because of careless mistakes, leading to a lot of wrong should not be wrong title, and even some of the words are not read the title to see. Phenomenon 3: Some students in the beginning as long as the class to ensure that serious listening will be able to score well; to later, despite the class is equally serious, but still unable to stop the results continue to decline, do not understand more and more. What exactly are these?