基金管理人与托管人履行各自的权利、义务所建立的是( )的运行机制。

A．相互联系

B．相互促进

C．相互竞争

D．相互制衡

For the sake of your health, I'd rather you ___ a flat in the mountain than ___ in downtown area as the

transport is getting more convenient.   [ ]

A. bought, one  

B. to buy, that  

C. bought, the one  

D. to buy, what