旅游饭店投资的原则有（）
A.数量适度原则
B.可行性分析原则
C.周密预算原则
D.结构合理原则
参考答案：B, C
贝母瓜蒌散的功用是
A．润肺涤痰，宽胸散结
B．清热化痰，宽胸散结
C．清热祛痰，理气开胸
D．清热化痰，理气止咳
E．润肺清热，理气化痰
— What's the matter with the man hanging his head there?
— Well, if you _____ know, he was caught stealing my bike.
A．must
B．may
C．can
D．shall
