In this section, you will hear several news items.
Listen to them carefully and then answer the questions that
follow. Questions 21 to 23 are based
on the following news. At the end of the news item, you will be given 15 seconds
to answer the questions. Now, listen to the
news. Why did the US break off the diplomatic relations with Iran
A．Iran militants stormed the US Embassy B．Dozens of American hostages were killed in Iran. C．The Iran government refused to give up nuclear experiments. D．The military conflict between the two countries led to the break.