Read the materials and answer the questions. Material 1: The Wujiang Waterway (Wujiang Crossing to Gongtan) is planned as an out-of-province water transport channel for Guizhou Province, and is also a full-scale water transport channel planned by the Ministry of Transport.

(1) The river is curved and has many dangerous shoals; the drop is large and the flow speed is fast; the water level changes greatly seasonally; in the karst landform area, surface water leakage is serious and the river water level is low; flowing water The erosion is serious, the water surface is not wide, and the terrain on both sides is steep (8 points for any four points)

(2) The need for the development of the national economy in the hinterland (changing resource advantages into economic advantages and resource development); water resources The need for comprehensive utilization; the need for improving the comprehensive transportation system for Wujiang water transport (improving traffic conditions); Wujiang water transport is conducive to the development of tourism in Guizhou Province (any answer to any three points will score 9 points)

(3) Enter After winter, cold air masses from the north continue to move southward. Blocked by the terrain of the Yunnan-Guizhou Plateau, the Kunming quasi-stationary front forms over western Guizhou and eastern Yunnan, and controls Guizhou for a long time. The Yunnan-Guizhou Plateau has high terrain and low ground temperatures. In addition, the warm and humid airflow from the Bay of Bengal brings a steady stream of water vapor. The transportation supplement has resulted in frequent freezing rain weather that lasts for a long time and causes severe damage in Guizhou Province. (Any three-point answer is worth 9 points)

Analysis of test questions:

(1) The river is straight and wide, with large water volume, high water level and smooth flow. Stability, small seasonal changes in water volume, and no ice are conducive to the navigation of the river. On this basis, combined with Guizhou's topography, climate, and river characteristics, the reasons for the poor navigation conditions in the section from Wujiang River in Guizhou to Gongtan in Chongqing are explained.

(2) Explain the significance of this waterway project to regional economic development from the aspects of the development of water transportation and the promotion effect of transportation conditions on Guizhou's resource development, tourism development, and comprehensive development of water resources in the Wujiang River Basin.

(3) Freezing rain is a weather phenomenon that occurs in the winter half of the year. The reason for the heavy rainfall and long duration of this freezing rain is related to the fact that Guizhou is affected by the Kunming quasi-stationary front for a long time in the winter half of the year, and the precipitation time Long, Guizhou is located on the Yunnan-Guizhou Plateau, with high terrain, low temperature, easy formation of freezing rain, and high water vapor content of warm and humid airflow from the Bay of Bengal.