油墨的着色料主要有颜料和（）两种，颜料又分为无机颜料和有机颜料两种。
A.染料
B.涂料
C.甲苯
D.母料
参考答案：A
— Susan,. why are you still here? They are all ready to start.
— I'm sorry, but I ______ when to meet. [ ]
A. don't tell
B. haven't told
C. wasn't told
退出Word应用程序窗口的组合键是（）
A．Ctrl+F4
B．Alt+F4
C．Ctrl+Shift
D．Alt+Shift
