Curve diagrams of air pressure changes when four weather systems pass through different areas.

① It is a warm front - before passing through, it is controlled by cold air masses and the air pressure is high; when passing through, the air pressure decreases; after passing through, it is controlled by warm air masses and the air pressure continues to decrease.

② It is high pressure (anticyclone) - the air pressure is low before passing through, and the air pressure increases; the air pressure is the highest when passing through; and the air pressure decreases after passing through.

③ It is a cold front - before it passes, it is controlled by warm air masses and the air pressure is low; when it passes through, the air pressure rises; after it passes, it is controlled by cold air masses and the air pressure continues to rise.

④ It is low pressure (cyclone) - the air pressure is higher before passing through, and the air pressure decreases; the air pressure is the lowest when passing through; and the air pressure increases after passing through.

So

1. When the weather system passes through, the curve of rainy weather that may occur is (D)

A, ①②③　B, ②③④

C. ①②④ D. ①③④

② is high pressure (anticyclone), the airflow sinks, it is difficult to form precipitation, and the weather is mostly sunny.

2. my country’s winter cold wave and northern summer heavy rain are related to the weather system represented by that curve (C)

Winter cold wave and northern summer heavy rain are caused by ③ (cold front) .