73. What made the passenger pigeon unique?
(A) Its decreased population
(B) Its custom of traveling in large groups
(C) Its winter migration habits
(D) Its sudden appearance before a storm
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統計: A(56), B(185), C(55), D(14), E(0) #2085052
統計: A(56), B(185), C(55), D(14), E(0) #2085052