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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
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更多 “ Some officials believe bird flu spread to Africa mainly due to ______.A. the trade of farm birdsB. the waste and liquids of infected birdsC. the fact that sortie people touched sick birds or any infected part of sick birdsD. the virus changed and started spreading in some new forms ” 相关考题
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