On the night of Black Friday, a blackout hit many theaters, restaurants and nightclubs in central London, but the subway system continued to function well.
该题题干中说到地铁在黑色星期五继续发挥良好功能时，使用了美国常用的 subway—词来说地铁，而录音中说到同样的意思时用的是英国人常用的tube, 所以 这是涉及英美用词差异的考题，考生需要对此熟悉。
[重点难点]
理解subway与 tube为同义词。
[录音原文]
Black Friday took on another meaning in central London when a power cut plunged a large part of the area into darkness. A total of 2,300 properties, including theaters, shops, restaurants and nightclubs，were affected. The Tube network worked as usual.