It's certainly hard work. But, a man who wishes to have a career has to make a great many sacrifices.
A:on the contrary
B:in addition
C:on the other hand
D:in that case
松赞干布与文成公主这两位历史人物体现了唐朝与哪一少数民族间的友好关系( )
马拉松长跑比赛全长约42____。
雨燕每小时能飞行170____。