-----How many students are there in the classroom?------.A. NobodyB. NoneC. No oneD. No

问题补充：

-----How many students are there in the classroom?------.

A. Nobody

B. None

C. No one

D. No

答案：

A. Nobody

(答案→)B. None

C. No one

D. No

解析：none指数量，nobody和no one指人。用于简略回答时，none用来回答由How many…和How much…引起的问句以及含“any(of)＋名词”构成的一般疑问句；no one/nobody用来回答Who…问句及含anybody构成的一般疑问句；no用于回答一般疑问句，故选B。