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【简答题】
如图所示，⊙O 1 、⊙O 2 的圆心O 1 、O 2 在直线l上，⊙O 1 的半径为2，⊙O 2 的半径为3，O 1 O 2 =8，⊙O 1 以每秒1个单位的速度沿直线l向右平移运动，7秒后停止运动，此时⊙O 1 与⊙O 2 的位置关系是（  ）. A．外切 B．相交 C．内切 D． 内含
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