如图3，正方体ABCD-A′B′C′D′的棱长为2，F是棱C′D′的中点，

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问题单项选择题

如图3，正方体ABCD-A′B′C′D′的棱长为2，F是棱C′D′的中点，则AF的长为（）。

A．3

B．5

C．√5

D．2√2

E．2√3

答案

参考答案：A

解析：

选择题

When asked to explain _____ he did to make his students so fascinated with his lessons, the teacher paused and thought deeply.

A．what was it that

B．that what it was

C．what it was that

D．what was it

判断题

新《企业会计准则——基本准则》所规定的附注是指对在会计报表中列示项目所作的进一步说明。