阿摩線上測驗
43.Birds are different from all other living vertebrates because they
(A) can fly;
(B) lack teeth;
(C) have feathers;
(D) are bipedal.
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統計： A(1), B(1), C(4), D(2), E(0) #3577772
統計： A(1), B(1), C(4), D(2), E(0) #3577772
