— How do the shops make money if  they sell at such low prices?  

— Manufacturers, it seems, are willing to bring down prices  ____ big volume purchases.   [ ]

A. under the name of            

B. on behalf of  

C. in return for                  

D. in preparation for

为了预防证件、钱物、行李遗失，导游人员应该做好下列哪些工作( )

A．多做提醒工作

B．在工作中用完游客的证件后立即归还

C．必要时代游客保管重要证件、行李

D．切实做好每次的行李清点、交接工作

E．每次游客下车后，提醒司机清车、关窗并锁好车门