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【单选题】
在SQL数据库中，视图（view）是从一个或几个基表（或视图）导出的表，它本身不独立存储在数据库中，即数据库中只存放视图的定义而不存放视图对应的数据，这些数据仍然存放在对应的基表中。因此视图——
A.
也是一个表
B.
是一个虚表
C.
是一个数据库
D.
是一个文件
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【单选题】听力原文：W: Mike, would you please tell us about Thanksgiving Day? We have no idea about it. M: Well, Thanksgiving Day is one of the oldest American holidays. It is celebrated on the fourth Thursday of No...
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【单选题】Please try to _____ here on time. Don’t keep us ______.
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【单选题】听力原文：W: Mike, would you please tell us about Thanksgiving Day? We have no idea about it. M: Well, Thanksgiving Day is one of the oldest American holidays. It is celebrated on the fourth Thursday of No...
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【单选题】听力原文：W: Mike, would you please tell us about Thanksgiving Day? We have no idea about it. M: Well, Thanksgiving Day is one of the oldest American holidays. It is celebrated on the fourth Thursday of No...
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