The figure shows the pressure distribution of 45 N; 1. The dominant wind direction in the illustrated season ① is A, and the west wind B is the east wind; C is north; D is south; 2. the atmosphere.

① Choose B, because it can be seen from the figure that the air pressure at 90 E is higher than that at both sides, and the horizontal air pressure gradient force on the same horizontal plane points from high pressure to low pressure, so it is easterly. (2) From the positioning, we can see that it is located in the plain of Western Europe, and because it is located on the west coast of the mainland at 45 degrees north latitude, it belongs to a temperate maritime climate, so the climate is characterized by mild and humid all the year round.