——David, could you tell me _________?——Every four years.
A:when the 2014 World Cup will finish
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
①收集反馈意见,进一步修改网站
②分析建立班级网站需求
③收集整理素材
④选择适当的工具,制作网站
如果恐龙与始祖鸟的化石在同一岩层中被发现,可推测两者( )