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  3. Research on animal intelligence always makes me wonder just how smart humans are.【C1】______the fruit-fly experiments described i

Research on animal intelligence always makes me wonder just how smart humans are.【C1】______the fruit-fly experiments described i

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问题     Research on animal intelligence always makes me wonder just how smart humans are.【C1】______the fruit-fly experiments described in Carl Zimmer’s piece in the "Science Times" on Tuesday. Fruit flies who were taught to be smarter than the average fruit fly【C2】______to live shorter lives. This suggests that【C3】______bulbs burn longer, that there is an【C4】______in not being too terrifically bright.
    Intelligence, it【C5】______, is a high-priced option. It takes more upkeep, burns more fuel and is slow【C6】______the starting line because it depends on learning—a gradual【C7】______— instead of instinct. Plenty of other species are able to learn, and one of the things they’ve apparently learned is when to【C8】______.
    Is there an adaptive value to【C9】______intelligence? That’s the question behind this new research.
    I like it. Instead of casting a wistful glance【C10】______at all the species we’ve left in the dust I. Q. wise, it implicitly asks what the real【C11】______of our own intelligence might be. This is【C12】______the mind of every animal I’ve ever met.
    Research on animal intelligence also makes me wonder what experiments animals would【C13】______on humans if they had the chance. Every cat with an owner, 【C14】______, is running a small-scale study in operant conditioning, we believe that【C15】______animals ran the labs, they would test us to【C16】______the limits of our patience, our faithfulness, our memory for terrain. They would try to decide what intelligence in humans is really【C17】______, not merely how much of it there is,【C18】______, they would hope to study a【C19】______question. Are humans actually aware of the world they live in?【C20】______the results are inconclusive.
【C20】
选项 A、By accident
B、In time
C、So far
D、Better still
答案C
解析 A项意为“偶然”；B项意为“及时”；C项意为“迄今为止”；D项意为“更好的是”。根据空格处的句意“迄今为止，这个问题还未得出肯定的结论”可以判断，正确选项是C。
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