1October 4 -6 20 14+65438 Changsha ushered in the first snow in winter. Read the chart and complete 6 ~ 8 questions. It was rainy at night on Friday the 4th, with a low temperature of 0℃ and a northeast wind of 3 ~ 4.

A. According to the movement analysis of airflow in the figure, ① is a cold front, ② is a warm front, ③ is a cyclone, ④ is an anticyclone. According to the analysis of the information in the table, the temperature has been decreasing during the transit of this weather system, below 0 degrees, and there is also snowfall. After the system transits, the temperature drops and the air pressure rises, so it is a cold front weather system. So, it is Figure 1. Therefore, it is correct;

B.② It is a warm front. According to the analysis of the information in the table, the temperature has been falling when the weather system transits, below 0 degrees, and there is also snowfall. After crossing the border, the temperature drops and the air pressure rises, so it is a cold front weather system. So it's Figure ①, which doesn't fit the meaning of the question.

C.③ It is a cyclone. According to the information in the table, the temperature of this weather system has been falling, and it is below 0 degrees, and there is snowfall. After this system passes through the border, the temperature drops and the air pressure rises, so it is a cold front weather system. So it's Figure ①, which doesn't fit the meaning of the question.

D.④ is an anticyclone. According to the information in the table, the temperature of this weather system has been falling, and it is below 0 degrees, and there is snowfall. After this system passes, the temperature drops and the pressure rises, so it is a cold front weather system. So it's Figure ①, which doesn't fit the meaning of the question.

So choose: a.