The following is the weather system in China.

A, cold and dry is in line with the weather characteristics in winter in China, so it is correct;

B, the picture is a cold front weather system, and it is winter in China, which does not meet the meaning of the question;

C, the picture is a cold front weather system, and it is winter in China, which does not meet the meaning of the question;

D, the picture shows a cold front weather system, but it is winter in China, which does not meet the meaning of the question.

So choose: a.