問題詳情
23. The evolution of the influenza virus that causes global pandemics of severe disease is referred as ______.
(A) Serotype-specific immunity
(B) Gene conversion
(C) Antigenic drift
(D) Antigenic shift
(E) Latency
參考答案
答案：99
統計：A:0,B:0,C:0,D:0,E:0
難度：計算中