75. According to the article, what fact about passenger pigeons is not fully understood?
(A) Their nesting habits
(B) Their social behavior
(C) Their flight patterns
(D) Their fast extinction

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統計： A(31), B(54), C(74), D(153), E(0) #2085054

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#4088505
A 築巢習慣 B 社會化行為 C 飛...
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