About________of the workers in that steel works________ young people.

A．third­fifths; are

B．three­fifths; is

C．three­fifths; are

D．third­fifth; are

以下色彩中，色彩间反差大的是（）。

A.红与绿

B.橙与黄

C.蓝与紫

D.黄与绿