Janet Mann, a professor of biology who was not involved in the study, said the results were not surprising in that they were consistent with how dolphins act in the ocean. “Of course they would use their echolocation to get more information. Dolphins have to solve problems all the time in the wild.” she said.

　　In the first experiment, trainer Emily Guarino indicated to Tanner that he was supposed to imitate, and placed plastic eyecups over each eye. Wordlessly, the trainer began to spin in the water with his arms wrapped across his shoulders. Tanner then did a similar spin. After that, researchers tested a dozen behaviors that Tanner already knew, including blowing bubbles underwater, swimming like a shark with the tail — or feet — moving side to side and floating on top of the water. Each behavior was tested twice at random, with and without the blindfold, as researchers recorded echolocation sounds underwater. Tanner was just as accurate at imitating a human — blindfolded or not — as he was at imitating another dolphin.

　　1. We can learn that dolphins are ______.

　　A. smart

　　B. dull

　　C. aggressive

　　D. mild

　　2. In the first experiment, Tanner imitated a human's movements by ______.

　　A. seeing

　　B. touching

　　C. listening

　　D. smelling

　　3. It is likely that dolphins swimming in the ocean use echolocation more ______.

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