When I went to watch the 16th Asian Games last month, I was greatly touched by the fact that ____ people

from all walks of life are working hard for ____ new Guangzhou. [ ]

A. the: a

B. /; a

C. the; the

D. /; the

磁盘调度的目的是降低若干个访问者执行信息传输操作的__________。