Most children, even the youngest of children, are delighted to be around cats and dogs. Bu

Most children, even the youngest of children, are delighted to be around cats and dogs. But these pets carry plenty of germs and allergens（过敏原）,prompting researchers to ask: Are cats and dogs really safe for children？
A study finds that, contrary to many parents' fears, owning cats or dogs does not increase a child's risk of developing allergies, and in fact, may actually protect them. The study's lead author, Dr. Dennic Ownby of the Medical College of Georgia, says that even he was very surprised by the results. Ownby and colleagues followed more than 470 children from birth to age 6 or 7, paring those exposed to cats and dogs during their first year of life to those who were not.
By using skin-prick tests for detecting mon allergies, the researchers found that, contrary to what many doctors had been taught for years, children who had lived with a pet were not at greater risk.
Even more remarkable, children who had two or more dogs or cats had an even greater reduction, up to 77 percent, in risk of allergies. Researchers suggest this protective effect may be the result of early exposure to lots of bacteria that are carried by dogs and cats. Exposing young children to these bacteria helps exercise their immune systems early in life so that they're better able to resist allergic diseases later.
There's something very important in that first year of life when the immune system is developing that we can retrain it away from an allergic response, said Dr. William Davis.
And while researchers are not encouraging parents to buy dogs or cats just to reduce a child's allergy risk, they say if a family already has one or more animals, there's no need to get rid of them.
【小题1】Why do the researchers feel “very surprised” by the results of the study?A．Because the results are contrary to their expectation．B．Because so many children are playing with cats and dogs．C．Because parents are so much worried about their children．D．Because children with animals may develop allergies easily．【小题2】Compared with children who have pets，those who haven’t      .A．will lose the chance to develop immune systemB．may suffer allergic diseases more oftenC．will reduce the harm from bacteriaD．can keep doctors away【小题3】It can be inferred from the passage that     ．A．pets are ill-treated by their ownersB．less families would like to own cats and dogsC．keeping pets is a good way to keep children healthyD．the results of the study can make families with pets feel at ease【小题4】The underlined word “it” in the fifth paragraph refers to    .A．the early lifeB．an allergic diseaseC．immune systemD．something important【小题5】What may be the best title of the passage?A．How to protect your kids from allergiesB．Your pets may be helping your kidsC．Bacteria do good to your kidsD．Advantages of owning petsA