—I'm sorry.I didn't catch the early bus and I had to _____ the next one.
一本练习册内有24份练习卷,总共有426道练习题,每份练习卷中有25题或20题或16题.那么这本练习册中有25题的练习卷的份数为( )
有关我国地势的叙述,下列说法错误的是( )