試題詳解

21. What is the passage mainly about?
(A) The similarities between dolphin communication and human language in terms of grammar and vocabulary.
(B) The use of facial expressions by dolphins during social play and its implications for animal cognition and communication.
(C) How dolphins' social behavior differs from that of other intelligent mammals like chimpanzees and dogs.
(D) The discovery of a specific visual signal in dolphins and its role in preventing conflict during playful interactions.