Look at the picture and answer the question: Question 1: The main function of the dam is () A. Retaining sand and storing water B. Generating electricity and irrigation C. Flood control and drought re

Look at the picture and answer the question: Question 1: The main function of the dam is () A. Retaining sand and storing water B. Generating electricity and irrigation C. Flood control and drought resistance D. Regulating air.

Question 1:A

Question 2: D.

Question 3:C

Test analysis:

Question 1: From the latitude and longitude of the map, it can be seen that the illustrated area is the Loess Plateau, and the main environmental problem facing this area is soil erosion, so the main function of the illustrated dam is to stop sand and store water.

Question 2: As can be seen from the latitude and longitude in the map, this area belongs to the Loess Plateau, and the prevention and control measures of soil erosion include biological measures and engineering measures. In the picture, A is the Loess Plateau, which can level the land and build farmland; B and C are both sloping fields, but the second place is steep, and the third place needs to be planted with trees and grass. The slope here is gentle and can be repaired. Ding is located at the bottom of the ditch, and should mainly stop sand and store water. With the increase of vegetation coverage, the benefits of river closure and flood control gradually increase.

Question 3: With the increase of vegetation coverage, the benefits of river closure and flood control gradually increase.

Comments: This question is less difficult. Locating regions according to latitude and longitude is the key to solve this problem. In addition, this topic can also examine the ecological and environmental problems faced by this area and the measures that should be taken.