Ancient Greeks were responsible for many of the _______ in science and other fields.

A．advances

B．progress

C．development

D．civilization

汽车挂档后，尚未抬起离合器，即行走或熄火者，是离合器（）故障。

A.分离不彻底

B.打滑

C.踏板无自由行程

D.踏板自由行程过大