Despite the warm personal relations with Hu, Bush admitted that ___ differences remain between the two countries, which makes ____ dialogue imperative.

A．the; a

B．the; /

C．/; a

D．/;/

当磨煤机事故停止运行时，（）

A、给煤机自动停止运行

B、引风机停止运行

C、送风机停止运行

D、给粉机停止运行