【单选题】(替换画线部分)Dolphins might be trained to cooperate with fishermen and help them by finding, tracking,herding, or even catching fish-- whose activities dolphins are expects.
【单选题】听力原文:W: Wasn't that a terrific lecture on dolphins? I didn't know that dolphins traveled in such large groups, or were able to communicate with other members of their group with those whistle-like sou...
【单选题】Irish Dolphins May Have a Unique Dialect Irish scientists monitoring dolphins living in a river estuary in the southwest of the country believe they may have developed a unique dialect to communicate ...