The crowd cheered wildly at the sight of Liu Xiang, who was reported ____ the world record in the 110-meter hurdle race.

A．breaking

B．having broken

C．to have broken

D．to break

可以用来鉴别甲烷和乙烯，还可以用来除去甲烷中乙烯的操作方法是（　　）

A．将混合气体通过盛有硫酸的洗气瓶

B．将混合气体通过盛有足量溴水的洗气瓶

C．将混合气体通过盛有水的洗气瓶

D．将混合气体通过盛有澄清石灰水的洗气瓶