阿摩線上測驗
40. Which of the following is NOT mentioned as a reason why birds are able to fly?
(A) Their bones are hollow.
(B) They have hard beaks instead of jaws.
(C) They have flat breastbones.
(D) Their feathers are light.
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統計： A(2), B(18), C(56), D(1), E(0) #611352
統計： A(2), B(18), C(56), D(1), E(0) #611352
