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髓的会穴是
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在数据库的如下两个表中，若学生成绩表的主键是学生号和课程名，学生表的主键是学生号。在下列所给的操作中，()操作不能执行。 学生成绩表
SECTION A CONVERSATIONS
Directions: In this section you will hear several conversations. Listen to the conversations carefully and then answer the questions that follow.
听力原文：M: Have you seen my glasses？ I can't find them anywhere.
W: Go into the bathroom and look in the mirror.
M: You mean I've got them on. How about that？
W: You're the most absent-minded person I've ever known.
M: I can't deny it. I'd lose my head if it weren't attached to my shoulders.
W: I'll never forget the time you went fishing and forgot to take your rod and reel.
M: I won't forget it either, but that's not the most memorable example of my forgetfulness.
W: How about the time you started to leave without having any pants on？
M: No, that's not it.
W: It couldn't be forgetting your wallet. You've done that a hundred times. I'm tired of guessing, tell me.
M: You never would have guessed. I don't believe I've ever told you about it though you were indirectly affect ed by the incident. I almost married my college sweetheart.
W: You're right. You've never told me about her.
M: Well, anyway, the day we were supposed to get married was such a beautiful day that I forgot all about the wedding and went fishing instead. The girl never forgave me.
W: I hardly blame her, though I'm glad things turned out differently.
Where were the man's glasses？
【C11】
Old Chinese are not used to buy things on ________ and are likely to save as much money as
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