How did the mother dolphin talk with her baby over the telephone? When scientists describe dolphins’ communicative skills, thei

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问题 How did the mother dolphin talk with her baby over the telephone?
When scientists describe dolphins’ communicative skills, their tone is rather ______.

选项 A、affirmative
B、negative
C、playful
D、speculative

答案D

解析 本题为推断题,可以用排除法进行逐项分析。A选项意思为"肯定的";B选项意思为"否定的";C选项意思为"玩笑式的";D选项意思为"推测的"。对海豚之间的交流我们只能推测。此外,"speculate"一词也出现在第二段第二行之中,所以可以判断出D为正确答案。
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