新概念英语第二册 summary writing71

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    After the Houses of Parliament were burnt down in 1834, Sir

    Benjamin Hall was made responsible for the construction of a huge

    clock, which became known as Big Ben. It is very accurate despite

    its immense size, for officials from the Greenwich Observatory have

    the clock checked twice a day. This clock, which has rarely gone

    wrong, can be heard on the B. B. C. When it is striking, because

    microphones are connected to the clock tower.