Some officials believe bird flu spread to Africa mainly due to ______.

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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

参考答案:

A 38．答案为A 此题考查文章句意理解、细节定位。略读文章，发现文章第4段中谈到了Now，officials with the U.N. Food andAgriculture Organization believe the Blain cause is trade in farm birds。分析后得知选项A的意思与具意思一致，故选A为答案。

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