Describe the weather changes

A. It is correct that there is more precipitation in summer and autumn and less precipitation in winter and spring in most parts of China;

B. Drought is a disastrous climate that has the greatest impact on China, so it is wrong;

C typhoons mainly affect the eastern coastal areas of China, ranging from Hainan province in the southernmost part to Liaoning, Jilin and Heilongjiang in the northeast. Except the northwest and Tibet, all parts of China can be affected by typhoons, so it is wrong;

D the temperature difference between north and south is large in winter and generally high in summer, so it is not right.

So choose: a.