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Small dogs generally live longer than big dogs so that small Yorkshire terri
Small dogs generally live longer than big dogs so that small Yorkshire terri
游客
2023-08-27
39
管理
问题
Small dogs generally live longer than big dogs so that small Yorkshire terrier(猎狐狗)next door could be around for a long time. But body size isn’t the only factor that【B1】______ how long dogs survive. Personality influences life span, too, according to a new study that might help explain how animal【B2】______ evolve.
Study on animals from ants to apes has found that different【B3】______have different personalities. Some are timid, others【B4】______Biologists have proposed that temperaments(性情)evolved along with life history. Bold, violent animals use a lot of energy fast in【B5】______short lives, the thinking goes, whereas calmer animals last longer, saving themselves to【B6】______ later in life. But it’s hard to run evolutionary【B7】______on these personalities in anything longer lived than a fruit fly. So evolutionary biologist Vincent from Canada【B8】______an idea about dogs. "All these breed differences reflect an experiment on artificial selection," says Vincent. The huge diversity of dogs resulted not from natural selection, but from generations of humans selecting animals with traits—the ability to chase foxes into holes, or herd sheep, or sit【B9】______on a sofa.
But evolutionary physiologist Joseph Williams of Ohio State University in Columbus isn’t convinced that what happened in dogs【B10】______evolution in nature. "For me, it still remains to be seen. Dogs are contrary to what you would expect in nature in terms of longevity," he says. Elephants can live for decades, whereas a mouse might make it through only for several seasons. On the other hand, a Chihuahua will generally outlast a Saint Bernard. [br] 【B9】
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答案
attractively
解析
语义推断题。空格前为动词sit,空格后为介词短语on a sofa,故应填入副词。结合录音可知,答案为attractively。
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