Read the Weather System Map of Spring in Some Areas of China and answer the following questions: (9 points) Figure 6( 1) has two places, A and B, and _ _ _ _ _ is high.

( 1) A？ The anticyclone rises (2) A? (3)①? After that? (4) Before the southerly wind in Changchun (southerly wind and southwest wind) (one point per space)

Test and analysis: (1) According to the isobar value in the figure, the air pressure in center A is high, and it is judged as a high pressure center; The air pressure in the center of B is low, so it is judged as a low-pressure center. According to the airflow movement, the high pressure is an anticyclone and the low pressure is a cyclone. Figure b shows the low pressure center, so the updraft is dominant in the vertical direction, while the high pressure center is dominant in the downdraft. (2) A is the center of high pressure, where downflow prevails, the weather is fine, and the temperature difference between day and night is large. (3) According to the anticlockwise convergence of the horizontal airflow of cyclones in the northern hemisphere, it can be judged that: ① cold air masses attack on the front to form a cold front; On the front, a warm front is formed due to the attack of the warm air mass. Judging from the moving direction of the front on the map, ① the front moves south, so the rain area is behind the front. But the front moves to the north, so the rain area is located in front of the front. (4) Changchun is located behind the warm front, controlled by the warm air mass, with high temperature, while Harbin is located on the side of the cold air mass, with low temperature. According to the isobar distribution in the figure, it can be concluded that the wind direction in Changchun is southerly.

Comments: This question is generally difficult and belongs to the regular test center. The key to solve the problem is to judge the pressure center according to the distribution characteristics of the isobar, pay attention to the difference between the pressure center and airflow movement, and analyze the formation process of frontal cyclone and the distribution and movement of cold front and warm front by drawing.