摘要： 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. 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．separate | C．define | D．recognize |