Teenagers _______ allowed to drive in the street. [ ]

A. should not be

B. should be not

C. not should be

D. shouldn't

生产经营单位与从业人员签订“工伤概不负责”等内容的协议，是（）。

A．乙方义务

B．甲方约定

C．无效协议

D．格式条款内容