17. One notable__________ of dolphins is their high intelligence which is evident in their advanced problem-solving skills and sophisticated ways of communication.
(A) habit
(B) trait
(C) guilt
(D) logic
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統計: A(5), B(13), C(6), D(5), E(0) #3347593
統計: A(5), B(13), C(6), D(5), E(0) #3347593