The picture shows a schematic diagram of the Yellow River Basin. Please answer. (8 points, 2 points in each space) (1) The section of the Yellow River prone to ice flood is () A. Longyangxia-

(

The picture shows a schematic diagram of the Yellow River Basin. Please answer. (8 points, 2 points in each space) (1) The section of the Yellow River prone to ice flood is () A. Longyangxia-

( 1)D； ?

(2) In summer, precipitation is concentrated and rainstorm washes away.

(3) The middle and upper reaches flow through arid and semi-arid areas, and the water quantity is small; Winter and spring enter the dry season, with less water and more evaporation in spring. ?

First, population growth, production development, and increased water consumption for water transfer; First, man-made waste or unscientific use causes waste. ? Change flooding irrigation into water-saving sprinkler irrigation or drip irrigation.

Analysis of test questions: (1) Ice flood occurs in rivers from lower latitude to higher latitude, so it is easy to occur in the upper reaches and estuaries of the Yellow River. (2) The high sediment concentration of the Yellow River reflects that the loess plateau flowing through the middle reaches of the Yellow River has serious soil erosion, and the weather is mostly caused by heavy rain. (3) The cut-off of the lower Yellow River is mainly due to the continuous decrease of incoming water in the middle and upper reaches. From the analysis of natural causes, mainly from precipitation and evaporation. The human reason is mainly the analysis of water consumption in the middle and upper reaches. The measures are mainly aimed at man-made reasons, and analyzed from the aspects of strengthening the unified management of water resources and saving water in the whole Yellow River basin.

Comments: This question is generally difficult and belongs to the basic test questions. Mastering the basic analytical thinking of river characteristics is the key to solve the problem. For this kind of test questions, students should strengthen the induction of basic analytical thinking in regular test sites in their usual study.