Geography A in Senior One indicates the weather system that affects China.

Figure A is a cyclone model diagram of the northern hemisphere (the title implies China, and the airflow in the diagram converges to the right).

Figure B is a warm front transit map (there is a bar on the left side of Figure B indicating that the air mass is not moving here, so the warm air mass climbs up to it).

If you put B in Figure A, the warm air mass in Figure B should be the airflow in the south of Figure A (that is, the arrow above the word "A"), so the front of Figure B corresponds to Figure A AB, and the warm front is the rainfall in front of it, so the rainfall range should be serial number 1.

Finished

In fact, Figure A can be an Asian depression that affects China in summer, and the center of the Asian depression is a low-pressure cyclone.