A:经济最繁荣
B:疆域最辽阔
C:对外战争屡获胜利
D:民主政治发展到顶峰
— Must we get to the airport before 8 o'clock?— No, you _____. The plane takes off at 12 o'clock.
当光从水里斜射到空气中时 ( )