Read the Yangtze River and Yellow River System Map and answer the question: (1) ① The _ _ _ _ _ _ (mountain range) in the map belongs to the _ _ _ _ _ _ _ trend, which is the watershed between the Yangtze River and the Yellow River.
(2) The Yangtze River and the Yellow River originate in Qinghai Province on the Qinghai-Tibet Plateau.
(3) The Yellow River flows through the Loess Plateau, taking away a lot of sediment and silting downstream to form an "overground river"; Therefore, the key to harness the Yellow River is sand control, and the fundamental measure is to strengthen soil and water conservation in the loess plateau in the middle reaches.
(4) The demarcation point of the upper and middle reaches of the Yellow River is A (filled in letters), and the demarcation point of the middle and lower reaches of the Yangtze River is C (filled in letters).
(5) (3) Bohai Sea, one of the inland seas in China, has Luchang Yantian, the largest Yantian in China; (4) Zhoushan Fishing Ground, the largest fishing ground in China; (6) Ganjiang, the mother river of Jiangxi; (8) Weihe River, the largest tributary of the Yellow River.
(6) (5) Hanjiang River, the largest tributary of the Yangtze River, and Wuhan is the city where it meets the mainstream.
(7) "The Yellow River is full of disasters, but only one episode is rich", in which "one episode" refers to the Hetao Plain in Inner Mongolia, which has the reputation of "Jiangnan in the world", and the Yellow River provides it with rich irrigation water sources.
So the answer is: (1) Qinling; Things; 800; (2) Qinghai-Tibet; Qinghai; (3) Loess; Surface rivers; Sand control; Strengthen soil and water conservation in the loess plateau in the middle reaches; (4) a; c； (5) Bohai Sea; Luchang Yantian; Zhoushan fishing ground; Ganjiang river; Weihe river; (6) Hanjiang River; Wuhan; (7) Hetao; Irrigation water source.