根据气象台天气预报，出现大雾天气将致使高速公路关闭，航班停飞。其中雾属于下列分散系中的

A．胶体

B．悬浊液

C．乳浊液

D．溶液

—My new bike rides very well though it doesn't cost much.

—Let me have a try. So _______. [ ]

A. it is

B. is it

C. does it

D. it does