下面哪个操纵面是主操纵舵面（）
A.副翼
B.扰流板
C.襟翼
D.水平安定面
参考答案：A
— Must I take the medicine every day? — No, you ____.
A. must not B. may not C. don’t have to
___ has taken away my notebook?
A．Which of you
B．Who of you
C．Which you
D．Who you、
