Dogs Bow to Wolves as Cooperators
If you need help herding some sheep or retrieving a stick, you can count on your canine companion, because dogs always seem to be keen on _________. But only if their partner is a person. When it comes to cooperating with one another, dogs are truly _________… and instead it’s wolves who’ve mastered the art of teamwork. That’s according to a study in the Proceedings of the National Academy of Sciences.
For thousands of years, humans have been breeding dogs that can do all sorts of neat tricks. And because pups aim to please, we’ve come to think that domestication has somehow _________ dogs’ powers of cooperation. But researchers in Austria have been wondering whether that notion could be barking up the wrong tree. Because left to their own devices, dogs are bigger _________ than wolves.
“So wolves live in _________ family packs, they cooperate in raising the young, they also cooperate in hunting and in defending their territory. So they really have a strong _________ on cooperation in many aspects of their lives. _________, free ranging dogs actually seek food mostly by themselves. It’s only mothers that raise their young. And they do form packs but they tend to be somewhat more _________, if you want.”
That’s Sarah Marshall-Pescini of the Wolf Science Center at the University of Vienna. She and her colleagues decided to test dogs’ and wolves’_________ powers of cooperation. In the setup, a pair of animals… either two dogs or two wolves… is __________ with a contraption (装置) that will allow the participants to __________ a tray of food… but only if both members of the team simultaneously pull on the two ends of a rope.
A dozen wolves and 14 dogs took the challenge. And the results? The wolves ran circles around their doggie descendants. In some 400 attempts, the wolf teams __________ a snack 100 times, which may not sound all that impressive until you compare it with the doggie couples, who, in nearly 500 trials, succeeded only twice.
Now, it’s not that dogs are less earnest learners. Or that they turned tail and avoided the apparatus (装置). Marshall-Pescini says the pooches (杂种狗) were __________ about the device.
“What seemed to be happening was that they didn’t want to get into conflict with each other. So they wouldn’t both go and try things on it but rather took it __________. And this really set back their capacity to cooperate.”
So rather than step on each other’s toes, the dogs took turns bowing out, giving their teammate a chance at the plate. That show of social grace left the poor pups with their tummies growling. And no __________ to enjoy.
【小题1】A.lending a paw | B.grabbing a bite | C.making a mess | D.taking a stand |
【小题2】A.lost | B.skilled | C.decisive | D.confident |
【小题3】A.disturbed | B.boosted | C.preferred | D.affected |
【小题4】A.remedies | B.winners | C.companions | D.loners |
【小题5】A.closely knit | B.hard won | C.locally sourced | D.well regulated |
【小题6】A.burden | B.basis | C.mark | D.dependence |
【小题7】A.In contrast | B.In particular | C.In reality | D.Strangely yet |
【小题8】A.exceptional | B.hesitant | C.inseparable | D.loose |
【小题9】A.relevant | B.related | C.relative | D.combined |
【小题10】A.equipped | B.presented | C.crowned | D.lined |
【小题11】A.serve | B.access | C.trap | D.fetch |
【小题12】A.handled | B.threw | C.spotted | D.scored |
【小题13】A.bored | B.stressful | C.curious | D.upset |
【小题14】A.in turns | B.in balance | C.at east | D.in order |
【小题15】A.treat | B.delight | C.pleasure | D.sight |