—Every four years.
A:when the 2014 World Cup finished
B:how often the World Cup takes place
C:how many teams take part in the World Cup
D:who may score the most goals in the World Cup
下列材料的硬度最大的是( )。
读 《谈生命》,“生命”像什么?作者作了形象的描述,请你再用比喻描述一下。