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

发布时间：2020-08-16 06:42:01


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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(答案→)A. distinguish
B. separate
C. define
D. recognize
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