下列人物中具有“部落联盟首领”和“奴隶制国家国王”双重身份的是( )
A:黄帝
B:尧
C:舜
D:禹
—But now they just _______ and wait for you to offer them pet food.
30是____个十,3个十乘4得____个十,就是____。