Question

A dark cloud is a ______ of thunderstorm.

1. A.
   symbol
2. B.
   sign
3. C.
   mark
4. D.
   signal

Answer 1

B
考查词义辨析。Symbol 象征，sign 迹象，征兆，mark 标记，signal 信号，句意：乌云就是闪电的征兆。根据句意选B。