Boys and girls, please turn to Page _____ and look at the _____ picture.
A:Fifth; five
B:Five; five
C:Fifth; fifth
D:Five; fifth
我国神话传说中,黄帝之后,黄河流域先后出了三个有名的人物叫尧、舜、禹,他们都是通过推举的方式成为部落联盟首领的。历史上把这种产生首领的办法称为( )
我国人口分布的重要地理界线是 ( )