单项选择题

H-live-n-one virus in the passage means ______.

A．farm birds
B．infected farm animals
C．people died in Hong Kong
D．a different kind of bird flu virus
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单项选择题
Some officials believe bird flu spread to Africa mainly due to ______.
A．the trade of farm birds
B．the waste and liquids of infected birds
C．the fact that sortie people touched sick birds or any infected part of sick birds
D．the virus changed and started spreading in some new forms
单项选择题
The passage focuses on ______.
A．wild and farm birds
B．a fin virus
C．bird flu
D．infected birds
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