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There are many page replacement algorithms in the page management. Most frequently used algorithm is(69).
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听力原文：M: Dr. Wilson, can I tall to you for a minute？
W: Sure, Fred, what is it？
M: I'm worried about my grade in your English class. I really want an "A", but...
W: I see. Well, it might be hard for you to get an "A". So far you have a "B" average. You would need a 97 or 98 on your final exam to get an "A". Do you think you can get that high a score？
M: Probably not. The problem is I have to have a "B" average in all the subjects to get the prize from our government, or I'll have to find a part-time job. I'm afraid it is difficult for me to put all my heart in my study if I have to work in my spare time. I'll probably get an "A" in history and a "B" in math, but I'll get a "C" in chemistry.
W: That is a problem, isn't it？ You'll have to have an "A" in English to get a "B" average.
M: Yes, but it doesn't look very good for me right now.
W: I gave two less tests this term than I usually do. That might have changed your grade a little. Maybe I'll give everybody a chance to write a composition in English, then you'll have a good chance to get an "A".
M: That would be great. I'll try my best. Thank you very much.
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