Weather forecast for Beijing 20 13

Reading the map, we can see that the shaded areas on the map are Shandong Province, Jiangsu Province, Shanghai and Beijing. Because of the high altitude in Lhasa, the average daily temperature is lower than that in Chongqing. The northerly wind prevails in the smog area. The daily temperature difference in Lhasa is 65438 06℃.

So: ab.