三角形两边长分别为3和6，第三边是方程x²-6x+8=0的解，则这个三角形的周长是[ ]

A.11

B.13

C.11或13

D.不能确定

— David, keep ______ in mind that you have to be home by 10 o'clock.

— OK, Mom, I will. 

A．it

B．me

C．this

D．one