单项选择题

Passage 1
Questions 11 and 12 are based on the passage you have just heard.
[听力原文]11-12
Londoners set their clocks by Big Ben. Big Ben is the bell in the world’s most famous clock. Most people call the clock Big Ben, the name really refers to the bell.
The clock’s tower stands 316 feet tall. It was built more than a hundred years ago. The tower now leans by fifteen inches. However, experts say that it is in no danger.
During World War Ⅱ the clock was hit by bombs. Still it kept perfect time. But in 1945 some birds settled on the hands of the clock. It lost five minutes.
Questions 11 and 12 are based on the passage you have just heard.

What is the Big Ben（）

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