問題詳情
17. Some birds that are molting maintain balanceduring flight by
(A) constantly preening and caring for theirremaining feathers
(B) dropping flight feathers on both sides at thesame time
(C) adjusting the angle of their flight tocompensate for lost feathers
(D) only losing one-third of their feathers
(A) constantly preening and caring for theirremaining feathers
(B) dropping flight feathers on both sides at thesame time
(C) adjusting the angle of their flight tocompensate for lost feathers
(D) only losing one-third of their feathers
參考答案
答案：B
難度：簡單0.75
統計：A(1),B(3),C(0),D(0),E(0)
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