[单项选择]Research on animal intelligence always makes me wonder just how smart humans are. 41 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 42 to live shorter lives. This suggests that 43 bulbs burn longer, that there is an 44 in not being too terrifically bright. Intelligence, it 45 , is a high-priced option. It takes more upkeep, burns more fuel and is slow 46 the starting line because it depends on learning—a 47 process—instead of instinct. Plenty of other species are able to learn, and one of the things they"ve apparently learned is when to 48 . Is there an adaptive value to 49 intelligence That"s the question behind this new research. I like it. Instead of casting a wistful glance 50 at all the species we"ve left in the dust I.Q.-wise, it implicitly asks what the real 51 of our own intelligence might be. This is 52 the mind of every animal I"ve ever met. Research on animal intelligence also makes me wonder what experiments animals would 53 on humans if they had the chance. Every cat with an owner, 54 , is running a small-scale study in operant conditioning. We believe that 55 animals ran the labs, they would test us to 56 the limits of our patience, our faithfulness, our memory for terrain. They would try to decide what intelligence in humans is really 57 , not merely how much of it there is. 58 , they would hope to study a 59 question: Are humans actually aware of the world they live in 60 the results are inconclusive.
A. tended
B. feared
C. happened
D. threatened