—Are you a student?

—                               .

1. A.
   Yes，I am
2. B.
   No．youaren't
3. C.
   Yes，youare
4. D.
   Yes，I’m

--Are you a student?

--_________________

A．No, you aren’t         B．Yes , I do         C．No , I can’t           D．Yes, I am

Are you a student _________ a teacher?

A. and      B. or      C. of      D. but

--Are you a student? --Yes, ________.