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【单选题】
下列说法：（1）两点之间的所有连线中，线段最短；（2）相等的角是对顶角；（3）过一点有且仅有一条直线与已知直线平行；（4）长方体是四棱柱．其中正确的有（ ）A.
1个
B.
2个
C.
3个
D.
4个
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A.
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B.
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