It seems that there’s a good reason why dogs are always seen as man’s best friend. Scientists have found that dogs are the only animals that can read emotion(情感)in faces much like humans. The finding suggests that like an understanding friend, dogs can see if we are happy, sad, pleased or angry.
When humans look at a new face, their eyes usually look across the left, falling on the right hand side of the person’s face first. A possible reason for this is that the right side of the human face is better at expressing emotions.
Scientists have now shown that pet dogs also have “left gaze bias(左视偏好)”, but only when looking at human faces. No other animal has been known to do like this before. Dr. Kun Guo showed 17 dogs pictures of human, dog and monkey faces as well as something else with his team. The dogs’ eyes and heads show a strong left gaze bias when the animals see human faces. But this did not happen when they were shown other pictures, including those of dogs.
Guo suggests that over thousands of years living with humans, dogs may have developed the left gaze bias as a way to guess our emotions.
“Recent studies show that the right side of our faces can express emotions better than the left. If true, then it makes sense for dogs and humans to see the right hand side of a face first.”
【小题1】 Why are dogs seen as man’s best friend according to the passage?

完形填空

通读下面短文，掌握其文意，然后从1～10各小题的四个选项中选出最佳答案。

　　One Friday morning in San Francisco, Robert Parley, a baby, was sleeping in his bed. The family pet, 1 , was asleep on the floor beside the baby's bed. Mrs Parley was busy with her housework. Suddenly 2 rocked the city.

　　Mrs Parley said she felt 3 she was in a storm at sea. She tried hard to reach the baby's room, but the house broke in two, dropping her to the first floor and 4 the baby's bed hanging on the edge of the two-storey house.

　　Mrs Parley tried to 5 to the second floor, but she couldn't because she had broken her leg. She shouted to the dog, Cody, 6 the baby. The dog jumped into little Robert's bed and carefully grabbed the baby 7 . The dog then jumped out of the bed with the baby, just as the bed crashed to 8 .

　　Mrs Parley called the police on her mobile phone and half an hour later, they climbed to the second floor to get the dog and 9 . The police said baby Robert didn't cry at all. Baby Robert and his mother were taken to the hospital, with Cody, the dog right beside them. All are now doing well. It is 10 to say a dog is man's best friend or at least Robert best friend.

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