煤矿企业必须加强职业病危害的防治与管理，做好作业场所的职业卫生和劳动保护工作，采取有效措施控制尘、毒危害，保证作业场所符合国家职业卫生标准。
参考答案：对
You might as well expect a river to flow backward ____ us carrying out the plan.
A．than stop
B．as to stop
C．as stop
D．so as to stop
