—Could you play the erhu before?
—
A:Yes, I can.
B:No, I could.
C:Yes, I could.
附加题:甲、乙两人分别从北村和南村同时向南而行,甲骑自行车每小时行16千米,乙步行每小时行6千米,2小时后甲追上乙,求南北两村的路程?
亚洲、欧洲流经国家最多的河流分别是( )
已知a,b是两个单位向量,下列四个命题中正确的是 ( )
In western countries, when your friend offers (提供 )you something, you can accept it directly(直接地), or refuse it politely. Therefore, which situation fits the western custom?