The picture is a schematic diagram of the Yellow River Basin, please answer. (8 points, 2 points for each blank) (1) The section of the Yellow River that is prone to flooding is ( ) A. Longyangxia－

(1) D;?

(2) Summer precipitation is concentrated and heavy rain washes out

(3) Upper and middle reaches In arid and semi-arid areas, the amount of water is small; when winter and spring enter the dry season, the amount of water is even less and evaporation is large in spring. ?

First, the increase in population, development of production, and increase in water diversion; second, waste caused by man-made waste or unscientific use. ?Change flood irrigation to water-saving sprinkler irrigation or drip irrigation.

Test question analysis: (1) Cold floods occur in the reaches of rivers flowing from lower latitudes to higher latitudes, so they are prone to occur in the upper reaches of the Yellow River and the estuary reaches. (2) The high sediment content in the Yellow River reflects the serious water and soil erosion in the Loess Plateau area where the middle reaches of the Yellow River flows. The weather reason is the erosion caused by heavy rains. (3) The interruption of flow in the lower reaches of the Yellow River is mainly due to the continuous reduction of incoming water in the upper and middle reaches. From the analysis of natural causes, it is mainly analyzed from the aspects of precipitation and evaporation. Humanistic reasons are mainly analyzed from the perspective of water consumption in the upper and middle reaches. The measures are mainly aimed at human causes, including strengthening unified management of water resources in the entire Yellow River basin and water conservation.

Comments: This question is of average difficulty and is a basic question. Mastering the basic analytical thinking of river characteristics is the key to solving the question. For this type of question, students should strengthen their basic analytical thinking on conventional test points in their daily study. induction.