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【单选题】
关系运算中的选择运算是（ ）。A.
从关系中找出满足给定条件的元组的操作
B.
从关系中选择若干个属性组成新的关系的操作
C.
从关系中选择满足给定条件的属性的操作
D.
A．和B．
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反馈参考答案：
举一反三
【简答题】A．She is afraid. B．She has never taken the bus before. C．She is new here. D．She does not want to tell him.
【简答题】She is new here. She doesn’t know the way to her .
【单选题】A.She is afraid.B.She has never taken the bus before.C.She is new here.#
A.
She is afraid.
B.
She has never taken the bus before.
C.
She is new here.
D.
She does not want to tell him.
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