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Breeders(词养者)have long found that puppies become their cutest selves at the eight-week mark; any older, and some breeders offer a discount to arouse would-be owners’ weakened desire. Such preferences might seem arbitrary, even cruel. But recent research indicates that peak puppy cuteness serves important purposes—and might play a fundamental role in binding dog and owner together.

In a study published this spring, Wynne, the head of Arizona State University’s canine-science laboratory, and his colleagues sought to pin down, scientifically, the timeline of puppy cuteness. Their finding largely matched that of breeders: People consistently rated dogs most attractive when they were six to eight weeks old. This age, Wynne says, coincides with a crucial developmental milestone: Mother dogs stop nursing their young around the eighth week, after which pups rely on humans for survival. (Puppies without human caretakers face death rates of up to 95 percent in their first year of life.) Peak cuteness, then, is no accident--at exactly the moment when our involvement matters most, puppies become irresistible to us.

It doesn’t hurt that humans seem to be especially defenseless to cute things. Oxytocin, the so-called love hormone, has been found to rise in dogs and their owners after they look in each other’s eyes—setting off the same feedback loop(反馈回路)that exists between human mothers and their babies. In other words, the more dogs get us to look at them, the more tightly bonded to them we grow.

Born blind and basically deaf, puppies aren’t interactive in their   first   weeks of life,   and Wynne notes that many people find animals in this stage alien and unappealing. A recent study focused on humans showed that, similar to six-week-old puppies, six-month-old babies are seen as significantly cuter than newborns. As the psychologists Gary Sherman and Jonathan Haidt have proposed, the delayed appearance of cuteness in human babies can also bring about a flood of social interactions, such as petting, playing, and baby-talking. These acts are developmentally crucial to puppies as well, but they can’t be carried out very effectively with the extremely young. And so “one is not born cute,” Sherman and Haidt conclude. “One becomes cute.”

1.What did Wynne find in his study?

A. Human care reduces puppies’ death rate compared with mother dogs’ nursing.

B. Mother dogs refuse to raise puppies as humans offer to help with the nursing.

C. Puppies1 attractiveness reaches its peak between six and eight weeks after birth.

D. Puppies present their cuteness to us because we participate in their survival.

2.The bond between dogs and humans builds up when   .

A. oxytocin increases in both dogs and their owners

B. dogs give us more looks than we do to them

C. humans are able to feel dogs’ cuteness at first sight

D. dogs and humans receive negative responses

3.The conclusion “One becomes cute.” implies that   .

A. newly born babies or puppies seldom show cuteness

B. cuteness serves for puppies’ survival and growth

C. even blind puppies can become cute through practice

D. it is a challenge for cuteness to be passed down

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