阿摩線上測驗
40. The author names all of the following as characteristics of pandemics EXCEPT ____.
(A) they spread very quickly
(B) they are caused by type-A virus
(C) they are regional outbreaks
(D) they occur once every ten years
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統計： A(0), B(0), C(2), D(1), E(0) #3313213
統計： A(0), B(0), C(2), D(1), E(0) #3313213
