44. What is the main idea of the passage?
(A)Bottlenose dolphins show strong ties to their family members.
(B) Bottlenose dolphins recognize their friends’ voices in the wild.
(C) Bottlenose dolphins produce whistles that distinguish themselves.
(D)Bottlenose dolphins demonstrate a unique type of animal communication.
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統計: A(3), B(21), C(15), D(38), E(0) #866852
統計: A(3), B(21), C(15), D(38), E(0) #866852