(1)发源:A __________山脉,注入_______海。 (2)支流:①__________ ②__________ ③__________ ④__________ ⑤__________ ⑥__________ ⑦__________ (3)城市:a__________ b___________ c__________ d___________ (4)水电站:e_____________ f___________ (5)长江上、中、下游划分点:g_____________ h______________