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一、高频考点,常考常新从最近五年全国卷一生物试题在各个知识点的命题次数我们可以看出,连续五年都命了试题或者命题次数在五次以上的知识点有:细胞代谢(光合作用、呼吸作用),遗传的基本定律(分离、自由组合),各种平衡调节(水、盐、血糖、渗透压),种群、群落和生态系统。预测题1给绿色植物浇H_2~(18)O,光照一段时间之后,绿色植物周围空气中出现了C~(18)O_2。其途径是
First, the high frequency test centers, often test Chang Xin from the national volume of the last five years a biological test in the number of propositions of the number of times we can see that for five consecutive years have been ordered questions or propositions in more than five times the knowledge points are: Cell metabolism (photosynthesis, respiration), the basic laws of inheritance (separation, free combination), various balance regulation (water, salt, blood sugar, osmotic pressure), population, community and ecosystem. Prediction 1 gives H_2 ~ (18) O to green plants. After a period of illumination, C 18 O 2 appears in the air around the green plants. The way is