A:40°
B:50°
C:60°
D:70°
Some sports that were part of the Olympics in the past have been removed to __________ new sports which are more popular.
我国古代经济重心自北向南逐渐南移的主要原因是( )
有14个篮球队进行比赛,若采用淘汰制,最后产生一名冠军,则至少要进行( )场比赛。
已知函数 f(x)=lg1+x1−x .