19.The author discusses ducks in order to provide an example of birds that
(A) grow replacement feathers that are very long
(B) shed all their wing feathers at one time
(C) keep their innermost feathers
(D) shed their outermost feathers first

答案:登入後查看
統計: A(1), B(2), C(5), D(1), E(0) #803518

詳解 (共 1 筆)

#7354451
這題會讓您感到困難是非常正常的!因為您...
(共 966 字,隱藏中)
前往觀看
0
0