— Did Aunt Li buy a skirt last Sunday?

— Sure. She chose_________ one of the two green skirts.

A．less expensive

B．the least expensive

C．the less expensive

D．the most expensive

市中心、商业中心等对颜色识别要求较高的机动车交通道路，可采用（）。

A.金属卤化物灯

B.高压汞灯

C.低压钠灯

D.高压钠灯