New strains of viruses are transmitted to man by_______. A. a type of wild pig B. diseased lower animals C. a group of migrating birds D. a variety of means

New strains of viruses are transmitted to man by_______.

A. a type of wild pig
B. diseased lower animals
C. a group of migrating birds
D. a variety of means

Trả lời

Chọn D

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