D. higher than the normal whale sound

　　30. According to Paragraph 3, which of the following statements is TRUE?

　　A. A diver realized the word “out”, which he had heard several times before, was from Noc.

　　B. The researchers heard the word, “out”, repeated once before they realized where it came form.

　　C. The researchers realized it was Noc when a diver asked who had told him to get out of the water.

　　D. Before they realized the word “out” came from Noc, the researchers had recorded the speech-like sounds.

　　31. In the researchers’ opinion, what contributed a great deal to Noc’s speech-like sounds?

　　A. Noc’s close association with humans.

　　B. Noc’s talent for imitation.

　　C. Whales’ special vocalizations.

　　D. The words being repeated several times.

　　D

　　Sometimes ideas do not appear when you are concentrating your attention and mysteriously appear when you are not. Modern science recognizes this as a result of incubating（酝酿) the problem in your subconscious(潜意识) , yet can't account for why it occurs.

　　When you quit thinking about a subject and decide to forget it, your subconscious mind doesn't quit working. Your thoughts keep making associations. This is why you've experienced suddenly remembering names, getting solutions to problems you've forgotten about, and ideas out of the blue when you are relaxing and not thinking about any particular thing.

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