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. __5__

　　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.

　　答案：1～5　CAFDG

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