实现不同的作业处理方式（如批处理、分时处理、实时处理等），主要是基于操作系统对（）管理采用了不同的策略。

听力原文：W: I wonder if you could sell me the Psychology textbooks. You took the course last semester, didn't you?M: As a matter of fact, I already sold them back to the school bookstore.Q: What de we learn from the conversation?(17)A．The woman has to get the textbooks in other ways.B．The woman has sold her used textbooks to the bookstore.C．The man is going to buy his textbooks from a bookstore.D．The man doesn't want to sell his textbooks to the woman.

A.
Q:
B.The
C.
B．The
D.
C．The
E.
D．The
F.

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听力原文：W: Here is this week's schedule, Tony. On Monday, there is the board meeting. Your speech to the lion's club is on Tuesday afternoon. Then on Wednesday you have an appointment with your lawyer and...M: Wait, you mean the business conference on Tuesday is cancelled?Q: What will the man do this Tuesday?(18)A．Attend a conference.B．Give a speech.C．Meet his lawyer.D．Make a business trip.

A...
M:
B.Attend
C.
B．Give
D.
C．Meet
E.
D．Make
F.

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