珠江是我国南方的一条大河,珠江三角洲是我国南方面积较大的平原,这里也是我国重要的农业区之一。而珠江三角洲的形成又不同于长江三角洲的形成。因此,讲清珠江三角洲的形成是初中《中国地理》第九章“南部沿海三省一区”教学中的一个重点,同时,也是一个难点。如何讲清这个问题?我们感到,可以采用图示、手势相结合的方法。具体讲,可以按下面五个步骤进行。首先,边板图边讲述珠江水系的构成,指出珠江水系包括西江、北江和东江三大支流,其中西江最长,通常被称为珠江的主干。第二步,板图,进一步指出珠江的三大 The Pearl River is a large river in southern China. The Pearl River Delta is a relatively large area in the south of China. It is also one of the important agricultural areas in China. The formation of the Pearl River Delta is different from the formation of the Yangtze River Delta. Therefore, clarifying the formation of the Pearl River Delta is a key point in the teaching of Junior High School “China Geography” Chapter 9 “Southern Coastal Three Provinces and One District”, and it is also a difficult point. How can we clarify this issue? We feel that we can use a combination of graphics and gestures. Specifically, the following five steps can be performed. First of all, the edge board maps the composition of the Zhujiang River system and points out that the Pearl River system includes the three tributaries of the Xijiang River, Beijiang River, and Dongjiang River. The Xijiang River is the longest and is often called the trunk of the Pearl River. The second step, the board map, further points out the three major