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    It’s not easy for experts to H1N1 flu in humans from regular human seasonal influenza. A. distinguish B. separate C. define D. recognize 【查看更多】

     

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    31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenza.

    A. distinguish                      B. separate               C. define                     D. recognize

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    31. It’s not easy for experts to ______ H1N1 flu in humans from regular human seasonal influenza.

    A．distinguish B．separateC．defineD．recognize

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