围绕本课标题 A famous clock 一个著名的大钟（大本钟）主题，AI 老师会出 若干个简单问题，
每个问题听完后，用 完整句子口头作答。
⚠️ 尽量说完整句子，不要只说一个词；优先用本课句型与词语：the famous clock which can be heard all over the world / on the B.B.C. / If the Houses of Parliament had not been burned down in 1834 / would never have been erected / named after Sir Benjamin Hall / responsible for the making of the clock / not only of immense size / extremely accurate as well / Officials from Greenwich Observatory / have the clock checked twice a day / microphones are connected to the clock tower / Big Ben has rarely gone wrong / failed to give the correct time / A painter who had been working on the tower / hung a pot of paint / slowed it down