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2023-09-24  35
问题 According to the passage, scientists have discovered that influenza viruses ______ . [br] New strains of viruses are transmitted to man by ______ .
选项 A、A type of wild pig
B、diseased lower animals
C、a group of migrating birds
D、a variety of means
答案 D
解析
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