阿摩線上測驗
19. ____ average, human adults contract between two and five colds annually, while children catch
as many as six to ten.
(A) On
(B) To
(C) At
(D) With
答案：登入後查看
統計： A(453), B(9), C(45), D(15), E(0) #2429978
統計： A(453), B(9), C(45), D(15), E(0) #2429978
