A:I am convenient to go there by train.
B:I go there by train at convenience.
C:It is convenient for me to go there by train.
D:It is convenience for me to go there by train.
①人们可以根据自身需要建立新的联系
②发展的实质是事物的前进和上升
③实践是推动认识发展的唯一动力
④做好量的积累,为实现事物的质变创造条件
请结合所学知识,回答下列问题。(把选项的序号写在横线上即可)
A.山顶洞人的项链
B.龙虎堆塑
C.雷公公、电婆婆
D.大型祭坛、神庙