题目内容
（请给出正确答案）
[主观题]
In the standard （x,y) coordinate plane, a line segment has its endpoints at （3,6)and（9,4).
In the standard (x,y) coordinate plane, a line segment has its endpoints at (3,6)and(9,4). What are the coor-dinates of the midpoint of the line segment？
A.(3,-1)
B.(3,1)
C.(6,2)
D.(6,5)
E.(12,10)
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