阿摩線上測驗
21. Which is characteristic of all vertebrates?
(A) a skull and a backbone consisting of vertebrae
(B) a calcified (hard) skeleton and four legs
(C) a hinged jaw
(D) lungs or lung derivatives
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統計： A(3), B(0), C(0), D(0), E(0) #3477263
統計： A(3), B(0), C(0), D(0), E(0) #3477263
