Youthinkyouknowyourdog.36.

问题详情：

You think you know your dog. 36. ___________ She probably recognizes you when she sees you. But can a dog tell by simply looking at you whether you have a happy or an angry expression on your face? Researchers in Austria have taught pet dogs to know the difference.

    37. ___________ When dog owners shout or speak in a strong, sharp voice, dogs often act guiltily and quietly move away from the area.

    Recently, researchers found that dogs can look at our faces, and tell the difference between a smile and a frown. The animals were able to recognize a look of approval from one of disapproval. Researchers at the University of Veterinary Medicine performed a series of experiments. 38. ___________ They showed the dogs two pictures of either the upper or lower half of a person's face. On one picture, the person looked happy. The other appeared angry. The dogs were then shown images of the eyes or mouths of people they had never seen before.

    39. ___________ Once the dogs learned to recognize which image was happy or angry, they could easily identify the same expressions in pictures of any face. Future studies will try to show whether dogs can learn the meaning of facial expressions. 40. ___________

    The researchers' findings were published in the journal Current Biology. They provide the first solid evidence that humans are not the only species that can read the body language of another species.

A. Dogs are very aware of sound.

    B. Dogs have feelings just as you do.

    C. But how well does your dog know you?

    D. They were also shown the left half of the faces used in training.

    E. Some dogs are very unhappy when they are left alone for a long time.

    F. They taught dogs to recognize facial expressions.

    G. For example, whether a frown shows that someone is angry.

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