给出以下四个结论：其中正确的结论个数为（）（1）圆柱体的上下

给出以下四个结论：其中正确的结论个数为（　　）
（1）圆柱体的上下两个圆一样大（2）圆柱、圆锥的底面都是圆
（3）圆柱是由两个面围成的（4）长方体的面不可能是正方形．

A．1个

B．2个

C．3个

D．4个

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