单项选择题

B Research on animal intelligence always makes us wonder just how smart humans are. Consider the fruitfly experiments described by Carl Zimmer in the Science Times. Fruits flies who were taught to be smarter than the average fruit fly31to live shorter lives. This suggests that32bulbs burn longer, that there is an advantage in not being too bright. Intelligence, it turns out, is a highpriced option. It takes more upkeep, burns more fuel and is slow 33 the starting line because it depends on learning a (an)34process instead of instinct. Plenty of other species are able to learn, and one of the things theyve apparently learned is when to stop. Is there an adaptive value to35intelligence Thats the question behind this new reach. Instead of casting a wistful glance backward at all the species weve left in the dust. I.Q.wise, it implicitly asks what the real36of our own intelligence might be. This is on the mind of every animal weve ever met. Research on animal intelligence also makes us wonder what experiments animals would37on humans if they had the chance. Every cat with an owner, for instance, is running a smallscale study in operant conditioning. We believe that38animals ran the labs, they would test us to determine the limits of our patience, our faithfulness, our memory for location. They would try to decide what intelligence in humans is really for, not merely how much of it there is.39, they would hope to study a fundamental question: Are humans actually aware of the world they live in40the results are inconclusive.