2. 职称英语
  3. According to the passage, scientists have discovered that influenza viruses ____

According to the passage, scientists have discovered that influenza viruses ____

游客2024-07-09  47
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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