紧扣教材出题,是高考的命题原则。命题者以教材中一些重要的例题、习题作为基础,编拟高考题是较为常见的现象,每年高考中有不小比例的此类考题。高考题目大多源于课本,而又高于课本,其中这“高”意味着对课本中的素材加以挖掘创新。课本素材是高考命题取之不尽的源泉。笔者就以 Closely related to the teaching materials is the proposition principle of the college entrance examination. The propositions are based on some important examples and exercises in the teaching materials. It is a common phenomenon to prepare college entrance examination questions. There are not a small number of such questions in the college entrance examination each year. Most of the college entrance exam questions originate from the textbooks and are higher than the textbooks. The “high” means that the materials in the textbooks are explored and innovated. Textbook material is an inexhaustible source of college entrance examination propositions. The author takes