What’s wrong with my son doctor?- serious just a slight cold. He’d better drink

问题补充：

--- What’s wrong with my son, doctor?

--- serious, just a slight cold. He’d better drink some water.

A. Everything

B. Nothing

C. Something

D. Anything

答案：

A. Everything

(答案→)B. Nothing

C. Something

D. Anything

解析：根据上下文的内容可知，故选B