The pressure change process curve of four weather systems passing through different areas in senior one geography.

① Warm front-controlled by cold air mass before crossing the border, with high air pressure; When crossing the border, the air pressure decreases; After crossing the border, it was controlled by the warm air mass, and the air pressure continued to decrease.

② High pressure (anticyclone)-the air pressure is getting lower and lower before crossing the border; The air pressure is the highest when crossing the border; After crossing the border, the air pressure drops.

③ Cold front-controlled by warm air mass before crossing the border, with low air pressure; When crossing the border, the air pressure rises; After crossing the border, the air pressure continued to rise under the control of the cold air mass.

(4) Low pressure (cyclone) —— Before crossing the border, the air pressure was higher and decreased; The air pressure is the lowest when crossing the border; The air pressure rose after crossing the border.

therefore

1. When the weather system transits, the curve of rainy weather may be

(4)

A、

①②③

B,

②③④

C,

①②④

d、

①③④

② It is high pressure (anticyclone), and the airflow sinks, so it is not easy to form precipitation. What a sunny day.

2. The winter cold wave and summer rainstorm in northern China are related to the weather system represented by curve (c).

The cold wave in winter and the rainstorm in northern summer are formed by ③ (cold front).