下列有关康熙帝维护国家统一和主权的措施,时序排列正确的是①平定三藩之乱 ②统一台湾③乌兰布通战役打败噶尔丹 ④与沙俄签订《尼布楚条约》
A:①②③④
B:②①④③
C:①②④③
D:①④②③
Tourists were feasting their eyes on the ocean scenery and suddenly they spotted an Iceberg (冰山)f____at a distance.
There _______ three books and a pencil on the desk.
52÷8=3 ( )