问题
选择题
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
答案
答案：A
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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
答案：A