单项选择题

柏拉图将下列情况成为城邦

A．公共住宅区
B．公共活动区
C．公共用餐区
D．公共交易区

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单项选择题听力原文：W: Hello, is that Steve? I'm stuck in a traffic jam. I'm afraid I can't make it before seven o'clock.M: Never minD.I'll be here waiting for you.Q: What do we learn from the conversation?(16)A.The man will meet the woman tomorrow.B.The man and the woman have an appointment at 7 o'clock.C.The woman can't finish making the jam before 7 o'clock.D.The woman won't be able to see the man this evening.

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B.The
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D.The
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单项选择题查询操作中的五种基本操作是（）。 A. 选择、投影、连接、并、交 B. 选择、投影、并、差、笛卡尔积 C. 选择、投影、并、交、差 D. 选择、投影、连接、笛卡尔积、并、