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【单选题】
下列四个命题中错误的个数是（ ） ①两条不同直线分别垂直于同一条直线，则这两条直线相互平行 ②两条不同直线分别垂直于同一个平面，则这两条直线相互平行 ③两个不同平面分别垂直于同一条直线，则这两个平面相互平行 ④两个不同平面分别垂直于同一个平面，则这两个平面相互垂直．A.
1
B.
2
C.
3
D.
4
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