The following measures to control the Huaihe River flood are correct: a. Resettlement to build towns, returning farmland to lakes, and leveling levees for flood discharge; B. Due to serious sediment d

The following measures to control the Huaihe River flood are correct: a. Resettlement to build towns, returning farmland to lakes, and leveling levees for flood discharge; B. Due to serious sediment deposition in Hongze Lake, the flow was cut off. D

Analysis of test questions: the main measures to control Huaihe River are: building reservoirs in the upper reaches, planting trees and controlling floods; The middle reaches use depressions and lakes to build flood storage projects; Excavation and expansion of downstream flood discharge canal.

Comments: This topic is generally difficult. Students only need to analyze the effective control measures of river flood disaster according to the different hydrological characteristics of the upper and lower reaches of the river, and pay attention to the actual situation of the natural geographical environment in the Huaihe River Basin.