阿摩線上測驗
49.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
答案：登入後查看
統計： A(2), B(5), C(8), D(20), E(0) #2705348
統計： A(2), B(5), C(8), D(20), E(0) #2705348
