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

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

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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 by Carl Zimmer’ s piece in the Science Times. 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 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(n)【C7】______process—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. 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 we’ ve ever met.
    Research on animal intelligence also makes us 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 locations. 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(n)【C19】______question; Are humans actually aware of the world they live in?【C20】______the results are inconclusive.
【C15】
选项 A、if
B、unless
C、as
D、lest
答案A
解析 考查逻辑关系。这句中的ran和would告诉我们，这是虚拟语气结构，是一种假设，而不是动物真的对人类进行了实验，故选A．if“如果”。unless“除非”，as“因为”，lest“以免”，均不符合题意。
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