2. 外语
  3. 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.

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.

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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.【B5】______, violent animals use a lot of energy fast in【B6】______short lives, the thinking goes, whereas calmer animals last longer, saving themselves to【B7】______ later in life. But it’s hard to run evolutionary【B8】______on these personalities in anything longer lived than a fruit fly. So evolutionary biologist Vincent from Canada came up with an idea about dogs. "All these breed differences reflect an experiment on artificial selection," says Vincent.【B9】______—the ability to chase foxes into holes, or herd sheep, or sit attractively on a sofa.
    But evolutionary physiologist Joseph Williams of Ohio State University in Columbus isn’t convinced that 【B10】______. "For me, it still remains to be seen. Dogs are contrary to what you would expect in nature in terms of longevity," he says.【B11】______. On the other hand, a Chihuahua will generally outlast a Saint Bernard.
【B1】
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答案determines
解析 语义推断题。此空所在定语从句缺少谓语，故空格处应填入动词。开篇以狗为例表明体型小的狗比体型大的狗寿命长，而本句用But转折说明狗的体型大小并不是“影响”或“决定”狗的寿命的唯一因素。结合录音，不难填人determines。
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