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
正确答案：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NowofficialswiththeUNFoodand
AgricultureOrganizationbelievetheBlaincauseistradeinfarmbirds分析后得知选项A的意思与具意思一致故选A为答案
