题目：
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
答案：
参考答案：B
解析：
[分析]： 因果关系的找寻和判断。关于该油田关闭的原因，原文提到... because of a small leak and severe pipeline corrosion即由于少量泄露和严重的管道腐蚀。由此可见，B项的说法是正确的。[解题关键] 掌握表示因果关系的信号词的使用。本题原文中because of 说明其后内容为原因。
