Just as a famous Chinese saying goes a timely heavy snow is a of good harvest next year.

问题补充：

Just as a famous Chinese saying goes, a timely heavy snow is a of good harvest next year.

A. mark

B. track

C. sign

D. appearance

答案：

A. mark

B. track

(答案→)C. sign

D. appearance

解析：词义辨析。Mark标记；track轨道，足迹；sign迹象，符号； appearance外貌。句意：正如一条著名的中国谚语所说，持续的大雪是来年好收成的一个迹象，瑞雪兆丰年。故选C。