The special weather in China mainly includes cold wave, plum rain, typhoon and sandstorm. Complete questions 22 ~ 23 with what you have learned. 22. The above special weather mainly occurs.

The morning, evening, duration and rainfall of plum rain will affect the agricultural production in the Jianghuai basin. If the plum rains come too early, the rainy season is too long and the rainfall is too heavy, floods and low temperature disasters will occur, which will seriously affect the agricultural harvest in summer and autumn. If it comes too late, or the rain period is too short, or even "empty plum", there will be drought, which will seriously affect the growth of summer and spring sowing crops.

So choose: C.