Geographical cyclone and anticyclone in senior one.

Read the schematic diagram of the weather system below and complete it.

(1) The circle in Figure A and Figure B represents _ _ isobaric line, and the dashed arrow in Legend ① represents _ _ horizontal pressure gradient _ _ force.

(2) According to the description of airflow conditions, the names of weather systems A and B are _ _ cyclone _ and _ _ anticyclone _ _ respectively; ? From the description of air pressure, they are called _ _ _ _ low pressure _ _ and _ _ _ high pressure _ _ respectively.

(3) In Figure C and Figure D, the weather system corresponding to Figure A is _ C? _; Indicates that the weather condition is _ _ rainy _ _ weather.

(4) The middle and lower reaches of the Yangtze River are controlled by weather system B from July to August, and _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _