Difficult as rumours on micro blog, or Weibo, are ________, the authorities will step up supervision so

that people will not be easily misled.[ ]

A. preventing      

B. to be prevented     

C. to prevent    

D. being prevented

在没有交通信号的道路上，机动车遇行人横过道路时，应当（）。

A.鸣喇叭，让行人快走

B.加速行驶

C.减速或者停车避让

D.绕行通过