Mr smith has little acquaintance_____ modern poetry while he has a wide knowledge ___  painting.When it comes____music,he has a talent _____it.

A．with; of ; to; for

B．of; about; to; of

C．with; about; at; of

D．of; of; to; for

在汽车制动时，液压制动系统中制动主缸与制动轮缸的油压相比较，（）。

A．主缸高于轮缸

B．主缸低于轮缸

C．轮缸与主缸相同

D．轮缸与主缸油压不变