【单选题】unit1
A.
Call the secretary again at 10 today,
B.
Make another appointment.
C.
Express his thanks for the call.
D.
Cancel the meeting with the secretary.
【简答题】Unit1 SectionB 10-12
【单选题】UNIT 10 1
A.
Yes, I agree. TV ads are the best.
B.
Humurous ones. I remember them.
C.
Companies with friendly service.
【简答题】无差异曲线具有哪些特点?试解释其经济意义。
【单选题】某幼儿园有800学生,若用二进制来编学号,最少需要________位来表示。 ( )
【单选题】某幼儿园有800学生,若用二进制来编学号,最少需要________位来表示。