10. Which structures are found exclusively in birds?
(A) Carina and syrinx
(B) Cloaca and feathers
(C) Epidermal scales and beak
(D) Gizzard and crop
(E) Wings and hollow bones
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統計: A(1), B(0), C(0), D(0), E(1) #3852864
統計: A(1), B(0), C(0), D(0), E(1) #3852864