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
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单项选择题
The recent outbreak of bird flu results in______.
A．the death of millions of people
B．the slaughter of a lot of chickens
C．a worldwide panic
D．too many exaggerated news reports
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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