Read the schematic diagram of the weather system in the northern hemisphere.

(1) According to the distribution and value of isobar, it is not difficult to judge that A is the center of high pressure and B is the center of low pressure. B controlled by low pressure, the central airflow rises, and rainy weather often occurs. Due to the effect of clouds, the atmosphere weakens the solar radiation during the day, and the temperature is not too high, while the reverse radiation of the atmosphere is strong at night, so the temperature difference between day and night in B is small.

(2) According to the representation of the front line in the figure, it can be judged that C is located in front of the cold front and will be affected by the cold front in the next few days, when there will be strong winds, rain and snow and cooling weather.

(3) Combining with the isobar, we can draw and analyze it according to the method that the wind direction intersects the isobar, from high pressure to low pressure, and the geostrophic force in the northern hemisphere shifts to the right. The wind direction at E is northwest wind (northerly wind). Because the isobar at F is denser than that at E, and the horizontal pressure gradient force is greater, the wind force at F is stronger.

(4) According to the analysis of the diagram, Station B is a cyclone in the northern hemisphere, and the horizontal movement direction of its airflow is counterclockwise convergence from all directions to the center, and the central airflow is upward.

So the answer is:

(1) high pressure and low pressure (1)? B

Reason: B is located in the center of low pressure, and rainy weather often occurs. During the day, the atmosphere has a strong weakening effect on solar radiation, and the temperature will not be too high. At night, the atmospheric inverse radiation is strong, the temperature is not too low, and the temperature difference between day and night is small. (2) Strong wind, cooling, cold front of rain and snow.

(3) northwest (north) f? Isobars are dense, and the horizontal pressure gradient force is large.

(4)