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According to the passage, scientists have discovered that influenza viruses ____
According to the passage, scientists have discovered that influenza viruses ____
游客
2023-09-24
35
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问题
According to the passage, scientists have discovered that influenza viruses ______ . [br] According to the passage a great variety of influenza can appear when ______ .
选项
A、H and N spikes are produced
B、animal and bird viruses are combined
C、dissimilar types of viruses recombine
D、two viruses of the same type are contracted
答案
C
解析
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