The following is the movement of the rain and snow weather boundary line in South China affected by a cold wave on 20 16 and 16. According to the answer to question 9-1 1

As can be seen from the picture, this cold air mass basically moves from north to south. Wuhan entered the cold wave range on the 20th, so it was C: Wuhan.

10, Chengdu is located in the middle of Sichuan basin, and the Qinling Mountains in the north block the cold air from going south (because the cold air is heavy, the air convection will go down, so it will be blocked by mountains); Wuhan is located in the east of Jianghan Plain, and there are no rolling mountains in the north to stop cold air from going south. So choose b: terrain.

1 1. Let's look at the locations of Hangzhou (120.2E, 30.3N) and Kunming (102.73E, 25.04N). Kunming lies in the southwest of Hangzhou. Although the date after the cold wave is not given, the direct point of the sun is south of the equator before the vernal equinox, so when the sun is highest in Hangzhou, the direct point of the sun is in the southeast of Kunming, and the sun shadow naturally points to A: northwest.