下列长度的三条线段，能组成三角形的是[ ]
A．2，2，4
B．2，2，5
C．2，3，6
D．2，4，5
答案：D
广州到北京的航线长一定，飞机飞行的速度和时间成反比例。 [ ]
— Sorry, Joe. I have to leave now.
— _____, Tina. I can do it by myself. [ ]
A. That's OK
B. You're welcome
C. Don't say so
D. You're right
