Read the weather situation map of China in February, 20l4, and answer questions 3 ~ 5. 3. The main reason for this weather system is () 4. 14 () 5.

A, windy weather often occurs when the cold front crosses the border, which does not conform to the meaning of the question;

B, the cold front often appears weather phenomena such as rain and snow, so it does not meet the meaning of the question;

C, the cold front often appears cloudy, windy, rainy and other weather phenomena, and the probability of haze weather is small, so it is correct;

D, cold front often appears cold wave and other weather, so it does not meet the meaning of the question.

So choose: C.