物军A dog could be a baby's best friend, according to a study published in a medical journal. Infants living in households with dogs were healthier and had fewer ear infections than those without a dog, the study found. Researchers also found that cats appeared to offer some protection, but the link wasn't as strong. The study, posted online Monday and based on 397 children who lived in rural and suburban parts of Finland, examined whether contact with dogs and cats during a baby's first year offers any protection from colds and resulting common ear infections.物军"The children having dogs at home were healthier, they had less ear infections and they needed less antibiotics(抗生素)," said Eija Bergroth, the study's lead author. One measure showed children with dogs were reported as being healthy for about 73 percent of the time, based on weekly questionnaires, compared with about 65 percent of children with no dog contact at home.物军While the study tracked just under 400 babies, the researchers said the results were statistically significant because it relied on weekly questionnaires filled out by parents. Dr. Bergroth explained that children who lived in households where dogs spent 18 or more hours a day outside, showed the most healthy days, fewer fevers and the least use of antibiotics compared with babies with no dog at home. One theory is dogs that spend a lot of time outside likely bring more dirt and bacteria inside the home compared with dogs and cats that spend more time indoors, she said. Researchers believe that exposure to dirt and bacteria builds up babies' immune systems.物军Earlier studies using smaller samples of children have shown conflicting results on the impact of animal exposure on infections and allergies(过敏症), though a study funded by the National Institutes of Health showed children exposed to two or more dogs or cats in their first year had lower chances of later developing all kinds of allergies than children exposed to one or no pets.物军( )1. Which of following is true according to the study published in a medical journal?物军A. There is a strong link between infants living with dogs and their health conditions.物军B. Infants living with dogs in suburban areas are healthier than those living in rural areas.物军C. Infants living in households with cats are healthier than those with dogs.物军D. Living with pets can prevent infants from colds and ear infections.物军( )2. How did the researchers explain the findings of their study?物军A. infants that spend a lot of time with dogs don't need to use antibiotics.物军B. Dogs that spend a lot of time outside help enhance infants' immune systems.物军C. Dogs and cats that spend much time indoors help build up babies' immune system.物军D. The outdoor exposure of infants to dirt and bacteria is helpful to their health.物军( )3. What might be the possible reason that the earlier studies have shown conflicting results?物军A. They were only using samples of dogs.物军B. They were using samples not big enough.物军C. They were studying children's exposure to more than two dogs or cats.物军D. They had lower chances of studying allergies of children exposed to one or no pets.物军( )4. What can be inferred from the passage?物军A. We should keep more dogs indoors for children.物军B. We should not use antibiotics for children.物军C. The more time dogs spend outside, the better they can protect children's health.物军D. The samples of the study only cover children in rural areas.物军( )5. What is the best title for the passage?物军A. Keep Dogs in Household.物军B. Dogs and Health of Children.物军C. Exposition to Dirt and Bacteria Better than Antibiotics.物军D. Pets: Children's Best Friends物军