问卷一般包括哪几个部分：（）
A、前言
B、结语
C、主体
D、问题
参考答案：A, B, C, D
How about _ _ after dinner?[ ]
A. exercising walking
B. to exercise walk
C. to exercising walking
The pilot, whether ______ or design, made the plane do a sharp turn. [ ]
A. by accident
B. at times
C. suddenly
D. all at once
