题目

The journey was long and tired .We left London at five 76．       o'clock in the evening and took eight hours in the train .77．       We’d been traveling for three hours before someone appear 78．       selling food and drinks . It was darkness all the time we were 79．       crossing Wales so we could see nothing across the window .80．       When we finally arrived Holyhead nearly everyone was 81．       sleeping . As soon as the train stopped , everybody came to life , 82．       grabbing suitcases and rush onto the platform . While we wer8．四联苯   的一氯代物有（　　）A．3 种B．4 种C．5 种D．6 种