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学生在低年级自然课上认识了个别事物的显著特征,在中年级重点要认识同类事物的共同特征,这可以说是认识的一个飞跃——由个别到一般。本册教材所选内容,力求符合中年级学生的认识水平,达到这一飞跃。例如:果实、茎的共同特征;哺乳动物、鸟的共同特征;空气中的物体都受到大气压力;水中的物体都受到水的浮力等。课文的表述不再使用“看一看”、“想一想”、“试一试”等文字,而是直接提出“观察”、“实验”、“思考”、“制作”等。
Students recognize the salient features of individual things in the lower grades of nature class. In middle class, they should recognize the common features of similar things, which can be said to be a leap in understanding - from individual to general. The selected content of this book teaching materials, strive to meet the level of understanding of middle school students to achieve this leap. For example: fruit, stem common features; mammals, birds common characteristics; objects in the air by atmospheric pressure; water objects are subject to water buoyancy and so on. Instead of using words such as “look at”, “think about it” and “give it a try”, the text shows “observation”, “experiment”, “thinking” and “making” directly.