How does the new vaccine work?A.By activating an immune response.B.By selecting one or two

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How does the new vaccine work?

A.By activating an immune response.

B.By selecting one or two genes.

C.By awaking the entire parasite.

D.By deactivating the entire parasite.

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗