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"I can always tell a graduate class from an undergraduate class," observed the instructor in one of my graduate engineering courses at California State University in Los Angeles. "When I say, 'Good afternoon,' the undergraduates respond, 'Good afternoon." But the graduate students just write it down."
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waydn1111

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why the graduates write it down?
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4Â¥2012-10-20 23:13:10
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2Â¥2012-10-20 15:26:44
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yuanyuan@

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I don't quite understand.
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3Â¥2012-10-20 22:51:45
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I didn't understand .
5Â¥2012-10-20 23:52:19
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