According to the passage，a great variety of influenza strains can appear when______. -题库考试答案搜索网

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

单选题

2021-12-31 18:38

A、H and N spikes are produced
B、animal and bird viruses are combined
C、dissimilar types virus recombine
D、two viruses of the same type are contracted

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正确答案

C

试题解析

[解析] 见第二段第二句话“The result of such recombinations is a great variety of strains constraining different H and N spikes. ”。

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