单项选择题

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.
How many people have been infected by bird flu in Hong Kong in 1997

A．At least three.
B．Six.
C．Thirteen.
D．Fifteen.
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单项选择题
What is the purpose of Winfred’s research
A．The components of tears.
B．Why some people cry more often than others.
C．How tears help us deal with emotional problems.
D．Whether crying really helps people reduce stress.
单项选择题
What is the most possible reason for the English Channel to emerge
A．Because of a flood millions of years ago.
B．Because of an earthquake millions of years ago.
C．Because of a flood thousands of years ago.
D．Because of a volcano eruption millions of years ago.
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