题目内容：

听下面一段独白，回答以下小题。

1.What does Big Ben refer to according to the text?

A. A bell.    B. A clock.    C. A tower.

2.Why will Big Ben remain silent?

A. There is something wrong with it.

B. The tower holding it will be repaired.

C. It will be cleaned by workers.

3.What does Jaggs think of the project?

A. Expensive.    B. Difficult.    C. Worthwhile.

4.Why will an elevator be built in the tower?

A. To carry more visitors.

B. To provide access for workers.

C. To convey some clock parts.