Noc started making the sounds after seven years in the open-ocean pen, and continued making them for another four years. He died five years ago. Researchers have now analyzed the sound recordings. It was the first time that sound recordings had shown how such sounds imitated speech and were different from the usual calls of the species.

　　The speech-like sounds were lower than normal whale sounds and much closer to those of the human voice. Also, whales talk to each other by blowing air through their noses, rather than using a larynx(喉), as people do. We don’t claim that our whale was a good imitator compared to such well-known imitators as parrots,” the researchers said. “However, the behavior we observed is an example of vocal learning by the white whale. It seems that Noc’s close association with humans played a role in how often and how well he employed his human voice.”

　　28. What can we learn about Noc from the text?

　　A. He had lived in the Pacific Ocean before he was caught.

　　B. He was kept in a Canadian foundation until he died.

　　C. When he was seven, he started making speech-like sounds.

　　D. He was able to imitate humans before he was caught.

　　29. Noc’s sound was considered unusual because it was________.

　　A. made by using a larynx

　　B. very similar to the human sound

　　C. different in the air and underwater

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