Many lifestyle patterns do such_______ great harm to health that they actually speed up_______ weakening of the human body.

A．a; /

B．/; the

C．a; the

D．/; /

高瓦斯矿井未建立瓦斯抽放系统和监控系统，或瓦斯监控系统不能正常运行的必须立即停产整顿。