Foreign Ministry spokesman Hong Lei on Friday again urged Japan to make serious efforts for the improvement of the relationship between the two countries and honestly face up to and____ its history of militarist aggression.

A．look on

B． concentrate on

C．reflect on

D．hold on

金属及非金属矿山井下水仓应由( )个独立的巷道系统组成。

A．1

B．2

C．3

D．4