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。