在独家代理方式下，规定双方权利和义务的是( )。
A．代理协议 B．包销协议 C．买卖合同 D．公证书
参考答案：A
All his attention________on the computer game he was playing,so he even didn't notice his mother
enter the room. [ ]
A. has been fixed
B. was fixing
C. was fixed
D. fixed
共同海损属于______
A．全部损失B．部分损失C．单独海损D．有时是全部损失，有时是部分损失
