--Listen! Someone is singing in the next room．Who         it be? Is it Wei Fang?

--No．It         be her．She is at school now．

A．can; may not

B．must; mustn’t

C．can; can’t

D．may; won’t

护栏按其在公路中的纵向设置位置分类，可分为（）

A、路侧护栏

B、路中护栏

C、桥梁护栏

D、路基护栏