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

游客2023-09-28 15

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

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