(14) Answer the following questions according to the materials. Material 1: The figure below shows the isotherm distribution of the United States at 24℃ in July. Material 2: California

(1) strik

(14) Answer the following questions according to the materials. Material 1: The figure below shows the isotherm distribution of the United States at 24℃ in July. Material 2: California

(1) strike: the west is roughly parallel to the coastline, showing a north-south strike, the central plain is roughly parallel to the latitude line, and the eastern and western mountainous areas protrude southward. (3 points) Reason: the southern coast is affected by cold current, foggy weather, weak sunshine, and the temperature in the north is higher due to warm current; Affected by coastal mountains. (3 points)

(2) irrigation water source guarantee (South-to-North Water Transfer Project); Improve transportation conditions; Technical development of agricultural products preservation and refrigeration; Changes in market demand; Improvement of agricultural production technology. (4 points for any answer, 4 points)

(3) Favorable aspect: It provides guarantee for irrigation production and domestic water use in South China. Disadvantages: the direction of runoff changes, and the amount of water entering the sea decreases, which is easy to cause seawater backflow; The climate in the transfer area is dry and the evaporation is large, which is easy to cause soil salinization. (4 points)

Test analysis:

(1) As can be seen from the figure, the isotherm at 24℃ in the figure is generally parallel to the north-south trend of the coastline. The southern part of the main western coast is affected by the California cold current, with foggy weather and weak sunshine, and the northern part is affected by the North Pacific warm current, with high temperature; The central plain is generally parallel to the latitude, dominated by the mainland, with a flat terrain, which is affected by solar radiation and is hot in the south and cold in the north; The eastern and western mountainous areas protrude to the south, mainly influenced by mountains, and the temperature is low.

(2) Northern California has a Mediterranean climate, while Southern California has a tropical desert climate; The South-to-North Water Transfer Project ensures the irrigation water source in the arid valley in the south. The improvement of transportation conditions and the development of agricultural products preservation and refrigeration technology have expanded its sales scope; The change of market demand affects its production scale; The improvement of agricultural production technology has improved its production quality.

(3) Northern California has a Mediterranean climate, while Southern California has a tropical desert climate; The South-to-North Water Transfer Project provides a guarantee for irrigation, production and domestic water use in southern China, alleviates the shortage of water resources, and is conducive to improving the ecological environment. The South-to-North Water Transfer Project has also changed the direction of runoff, and the original river channel has reduced the amount of water entering the sea, which is easy to cause seawater backflow; The climate in the transfer area is dry, evaporation is large, and unreasonable irrigation is easy to cause soil salinization.