设计意图科学源于观察。苏教版《科学》教材从学生一接触到科学课就通过各种活动让学生学会观察。三年级上册还专门设置了一个过程技能训练的单元——《观察与测量》,以期让学生学会各种观察的方法。但在教学中我们发现,学生的观察往往很粗糙,他们不会沉下心来仔细地对一种物质 Design Intent Science comes from observation. The educational version of “Science” teaching materials allows students to observe through various activities as soon as they come into contact with the science class. The third grade also set up a special set of process skills training unit - “observation and measurement”, in order to allow students to learn a variety of observation methods. However, in teaching we find that students often observe the observation is very rough, they will not sink down carefully to a substance