2. 外语
  3. According to the passage, scientists have discovered that influenza viruses ______. According to the passage a great variety of

According to the passage, scientists have discovered that influenza viruses ______. According to the passage a great variety of

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问题 According to the passage, scientists have discovered that influenza viruses ______.
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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