单项选择题

H5N1 is a flu strain ______.

A．limited to Hong Kong
B．which first affected human beings in 1961
C．crossing species barriers
D．which was first isolated from American birds
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单项选择题
The Spanish flu was the worst plague in history because ______.
A．it led to a terrible loss of human life
B．it was the earliest kind of flu
C．it broke out after World War One
D．it infected many animals as well
单项选择题
What should be done in order to stop the spread of bird flu
A．All infected fowls have to be slaughtered.
B．The government should quarantine all the flu patients.
C．No fowl should be raised.
D．Specialized hospitals should be established.
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