Bộ 20 đề ôn thi vào Chuyên Anh năm 2023 cực hay có lời giải (Đề 40)
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According to the passage, a great variety of influenza strains can appear when______. A. H and N spikes are produced B. animal and bird viruses are combined C. dissimilar types of viruse

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According to the passage, a great variety of influenza strains can appear when______.

H and N spikes are produced

animal and bird viruses are combined

dissimilar types of viruses recombine

two viruses of the same type are contracted

Giải thích

Chọn C