An experienced doctor usually judges a patient’s illness according to the various.A. signs

问题补充：

An experienced doctor usually judges a patient’s illness according to the various.

A. signs

B. symptoms

C. signals

D. marks

答案：

A. signs

(答案→)B. symptoms

C. signals

D. marks

解析：

考查名词词义。sign信号，暗号；symptom症状，征兆；signal预兆，征象；信号；mark印，记号，符号。由句意可知B项正确。