B. on the spar top

　　C. at sea level

　　D. behind the blades

　　65. Wide applications of deepwater wind power technology can ____________.

　　A. solve the technical problems of deepwater windmills

　　B. make financial profits by producing more turbines

　　C. settle the arguments about environmental problems

　　D. explore low-carbon power resources available at sea

　　7.（2011·湖北卷）B

　　Howling is a behavior commonly observed among a wolf nark. An animals, wolves work together to hunt and rely on howling was an important means of communication each other. There are different explants of a wolf’s howl and it appears that there may be more to discover.

　　One theory is that wolves howl to bend better together. It’s almost as if howling together helps the pack stay together. Perhaps something similar to people feeling a sense of involvement with each other when singing a song together . But this theory may be wrong, explains Fred H. Harrington, a professor who studies wolf behavior.

　　Indeed, there have been tines when wolves have been seen one moment howling in a exhorts, and the next, quarreling anions each other. It appears that usually the lowest-tanking members of the pack may actually be “punished” for Joining in the chorus at times. So is howling a way to strengthen a social bond or just a way to reconfirm status among its members? ——Why do wolves howl for sure?

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