已知⊙O₁和⊙O₂的半径是一元二次方程x²-5x+6=0的两根，若圆心距O₁O₂=5，则⊙O₁和⊙O₂的位置关系是（　　）

A．外离

B．外切

C．相交

D．内切

When a vessel is aground,（）.

A.she is underway

B.she is not underway

C.whether she is underway cannot be determined

D.she might be or not be underway