最能体现五四运动性质的口号是( )
A:外争主权,内除国贼
B:废除二十一条
C:还我青岛,誓死力争
D:拒绝在对德合约上签字
—Hurray! Actually these competitors were all strong, but our students made it.
如图中,人体形成尿液和暂时储存尿液的器官分别是( )