cats until now, says Oregon State University's Kristyn Vitale Shreve, a co-author of the study. "We're trying to catch up."

Cats are generally considered in the U.S. as untrainable and unsocial, she says, but they can be taught using the same general principles as dogs - so long as the incentives （诱因） are right. Vitale's next study will research how to use cats' preferences to train them.

What else don't we know about cats? For instance, can you distinguish cats' emotions according to their behavior? Cat emotions are infamously hard to figure out: A new study in Italy by scientists found that most owners don't recognize the range of signals cats use to show stress. "Dog owners know more about dog behavior," says author Chiara Mariti. In contrast, cat owners often interpret their pets' behavior as normal to the species, rather than a signal about how they're doing. Scientists are working hard to solve such mysteries.

Last year a Swedish university launched a five-year study into human-cat communication. The goal: to see if cats react to different ways humans speak to them, and to translate meows into emotions and desires.

25. What do Kristyn Vitale Shreve's words "We're trying to catch up" mean?

A. We will try to catch more cats for further research.

B. We are trying to do more research on cats.

C. We are running after the cats to test their reaction to stimuli.

D. We have much difficulty doing research.

26. What do Americans generally think of cats?

A. They're just like dogs. B. They like to interact with people.

C. Their emotions change quickly. D. They're hard to train.

27. It can be inferred from the passage that .

A. the Swedish university will study how to interpret cat voice.

B. food stimulus is more preferred by cats, compared with human interaction.

C. Cats can be trained in exactly the same way we train dogs

D. We can see the outcome of the human-cat communication study as early as five years later

I love the Olympics because there are always so many amazing stories of dedication, perseverance and sportsmanship. The last Olympics in Rio de Janeiro were no exception. But one of the best life lessons I learned was not an example of any of the noble qualities listed above. This life lesson comes from the tragic tale of Chad Ie Clos from South Africa.

Chad le Clos is a famous freestyle and butterfly swimmer, having won a world champion and an Olympic champion. In the 2012 Olympics he even beat Micheal Phelps in the 200-meter butterfly, Phelps's favorite race. When Phelps announced he