問題詳情
1. Innate immunity________.
(A) depends on an infected animal's previous exposure to a pathogen
(B) is found only in vertebrates
(C) is based on recognition of antigens that are specific to a pathogen
(D)is the first, and most general, mechanism of protection against pathogens
參考答案
答案：[無官方正解]
難度：計算中-1
書單：沒有書單，新增