— Could you tell me_____ ?              

— About half an hour.

A．how long it takes to walk to the Science and Technology Museum from school

B．how long it took to walk to the Science and Technology Museum from school

C．how far was it to walk to the Science and Technology Museum from school

D．how far it was to walk to the Science and Technology Museum from school

甲持刀追杀乙，乙的朋友丙路过，用气枪打伤了甲，丙的行为是( )。

A．正当防

B．紧急避险

C．故意犯罪

D．防卫过当