【简答题】A.Through a wide variety of high-frequency sounds. B.Through a wide variety of low-frequency sounds. C.Through their varied swimming gestures. D.Through the echolocation.
【简答题】A.Through a wide variety of high-frequency sounds. B.Through a wide variety of low-frequency sounds. C.Through a narrow range of high-frequency sounds. D.Through a narrow range of low-frequency sounds...