According to the passage, scientists have discovered that influenza viruses ______ . New strains of viruses are transmitted to

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问题 According to the passage, scientists have discovered that influenza viruses ______ .
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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大学英语三级A级

大学英语三级

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According to the passage, scientists have discovered that influenza viruses ______ . New strains of viruses are transmitted to

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