Read the schematic diagram of isobar distribution on a day in February, 20 14, and answer questions 8 ~ 9. A research study group simulates the weather forecast, the most reasonable description is (

A, the southern Xinjiang region is behind the front, and the cold front is rainy after the front, so the southern Xinjiang region is rainy, so it does not meet the question;

B, the cold front will continue to move southward, that is, the cold air will move southward, and the high temperature in the middle and lower reaches of the Yangtze River will be eased in recent days, which does not meet the meaning of the question;

C, because it is February, China is in winter, so it is difficult for South China to be affected by tropical cyclones, and summer and autumn have a greater impact, so it does not meet the meaning of the question;

D. The cold front will continue to move southward, so there will be an obvious cooling, strong wind and rainy weather in the Beijing-Tianjin-Hebei region, so the smog may ease in the next few days, so it is right.

Therefore, choose: d.