操作系统的设备管理应具备的主要功能是（），（），完成I/O操作和缓冲管理与地址转换.

M：You didnt go to the lecture last night either, did you?W：No，I had a severe headache．Q：What do we learn from this conversation?（）

A．The man went to the lecture, but the woman didn't.
B．The woman went to the lecture, but the man didn't.
C．Neither of speakers went to the lecture.
D．Both speakers went to the lecture.

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W：Have you bought all the books you need this semester yet?M：Ive bought a book for listening practice，but the text-books for intensive reading and literature were sold out．Q：Which course has the man got a book for?（）

A．Intensive Reading,
B．Extensive Reading.
C．Literature.
D．Listening.

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