△ABC的三个角A<B<C，且２Ｂ＝Ａ＋Ｃ，最大边为最小边的2倍，则三内角之比为

                   .

—I'm sorry I went out for a smoke. I was very tired.

—There's no ______ for this while you are at work. [ ]

A. cause

B. excuse

C. matter

D. choice