The most suitable places to predict future weather trends with the above proverbs are () a, 1B, 2C, 3D and ④.

Test center: barometric system and weather frontal system and weather special topic: analysis: mainly investigate frontal cyclone. The proverb "the south wind blows to the end and the north wind returns" refers to the passage of a cold front. The dotted line in the figure represents two trough lines of a weather system in the mid-latitude region of the northern hemisphere. The cyclone in the northern hemisphere flows counterclockwise from the periphery to the center, forming a cold front on the trough line between ① and ②. A warm front is formed on the groove line between ③ and ④. The weather system described in the material is a cold front, and the weather system shown in the figure is a frontal cyclone in the northern hemisphere. The cyclone in the northern hemisphere flows counterclockwise to the center, and ② is about to be affected by the cold front. So B. Comments: This question is moderately difficult and belongs to a knowledge test. The key to solve the problem is to master the relevant knowledge of frontal cyclone.