阿摩線上測驗
22 It is not easy to ＿＿＿＿＿ tigers from leopards. They look so similar.
(A) distinguish
(B) extinguish
(C) observe
(D) establish
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統計： A(1082), B(232), C(283), D(131), E(0) #2019795
統計： A(1082), B(232), C(283), D(131), E(0) #2019795
