题目

已知⊙O1和⊙O2的半径分别是一元二次方程x2－5x+6=0的两根,且O1O2=1,则⊙O1和⊙O2的位置关系是_______. 答案：内切My father is the person ________ camera I nearly lost.A.whoB.whoseC.thatD.where