2002年12月26日，俄罗斯特种部队使用强力麻醉剂芬太奴（Fentanyl）和氟烷（Halothane）。下列有关氟烷（CHClBr—CF₃）说法正确的是：

A 该氟烷易溶于水，也易溶于有机溶剂

B 该氟烷扩散到空气中能破坏臭氧层

C 该氟烷密度比水小

D与该氟烷互为同分异构体的氟烷（不含本身）有三种

Passage Two

The Prudhoe Bay oilfield has been shut down because ______.

A．there was a serious leakage problem with the pipeline

B．the pipeline suffered a small leak and severe corrosion

C．better pipeline was needed to meet the increasing production

D．the newly-replaced pipeline didn’t work properly