练习材料：
When you visit London, one of the first things you will see is Big Ben, the famous clock which can be heard all over the world on the B.B.C. If the Houses of Parliament had hot been burned down in 1834, the great clock would never have been erected. Big Ben takes its name from Sir Benjamin Hall who was responsible for the making of the clock when the new Houses of Parliament were being built. It is not only of immense size, but is extremely accurate as well. Officials from Greenwich Observatory have the clock checked twice a day. On the B.B.C. you can hear the clock when it is actually striking because microphones are connected to the clock tower. Big Ben has rarely gone wrong. Once, however, it failed to give the correct time. A painter who had been working on the tower hung a pot of paint on one of the hands and slowed it down !
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任务配置：L0 +L4
笔记：
1.知识点
（1）If the Houses of Parliament had not been burned down in 1834, the great clock would never have been erected. 如果不是国会大厦在1834年被焚毁的话，这座大钟永远也不会建造。
①这句话用的是虚拟语气，表示与过去的事实相反的一种假设。
②the Houses of Parliament,国会大厦。由于英国议会是由上议院(House of Lords)和下议院(House of Commons)组成的，所以Houses为复数形式。
③burn down为固定短语，在这里表示“(使)烧成平地”、“烧毁”
（2）Big Ben takes its name from Sir Benjamin Hall who was responsible for the making of the clock…“大本”钟得名于本杰明·霍尔爵士，……他负责建造大钟。
①take one's name from 名字取自于
②Sir用于英国人的全名(或名字)之前时表示“爵士”(不单独用于姓之前)，如 Sir John Gilbert(约翰·吉尔伯特爵士)或 Sir John(约翰爵士)，但不能称 Sir Gilbert。
③responsible for表示“对……需负责任/承担责任的
（3）It is not only of immense size…此钟不仅外型巨大……
be of…表示人或物的特征：we are of the same age/size
（4）Big Ben has rarely gone wrong. “大本”钟很少出差错。
go wrong为固定短语，其含义之一是“(机器等)发生故障”、“出毛病”
（5）slow…down,把……弄慢。
Slow down为固定短语(可分开使用)，其含义之一为“(使……)慢下来/减速”
（6）a pot of paint 一桶油漆