高速公路收费制式有：（）、（）、（）、（）。
参考答案：均一式收费；开放式收费；封闭式收费；混合式收费
(2013·山东省十二校高三二模)—Do you think I should accept the invitation to his birthday party?
—________ If I were in your shoes, I certainly would.
A．None of your business.
B．Why not?
C．It depends.
D．I don't think so.
音色取决于（）的构成。
