4.Most children,even the youngest 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 leading author,Dr-Dennis Own by of the Medical College of Georgia,said that even he was"very surprised"by the results.He and his colleagues followed more than 470 children from birth to age 6 or 7,comparing those exposed to cats and dogs during their first year of life to those who were not.
By using skin prick (皮肤针刺) tests for detecting common 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 even great reduction,up to 77%,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.
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.

28.Why do the researchers feel"very surprised"by the results of the study?C
A.Because parents are so much worried about their children.
B.Because so many children are playing with cats and dogs.
C.Because the results are contrary to their expectation.
D.Because children with animals may develop allergies easily.
29.Compared with children who have pets,those who haven'tB.
A.will lose the chance to develop immune system
B.may suffer allergic diseases more often
C.will reduce the harm from bacteria
D.can keep doctors away
30.It can be inferred from the passage thatA.
A.the results of the study can make families with pets feel at ease
B.fewer families would like to own cats and dogs
C.keeping pets is a good way to keep children healthy
D.pets are ill-treated by their owners
31.What may be the best title of the passage?B
A.How to protect your kids from allergies.
B.Your pets may be helping your kids.
C.Bacteria do good to your kids.
D.Advantages of owning pets.
20.You are the collector in the gallery of your life.You collect.You might not mean to but you do.One out of three people collects tangible things such as cats,photos and noisy toys.
These are among some 40 collections that are being shown at"The Museum Of"-the first of several new museums which,over the next two years,will exhibit the objects accumulated(积累)by unknown collectors.In doing so,they will promote(推动)a popular culture of museums,not what museums normally represent(代表).
Some of the collections are fairly common-records,model houses.Others are strangely beautiful-branches that have fallen from tree,for example.But they all reveal (显露)a lot of things:ask someone what they collect and their answers will tell you who they are.
Others on the way include"The museum of Collectors"and"The Museum of Me."These new ones,it is hoped,will build on the success of"The Museum Of."The thinkers behind the project want to explore why people collect,and what it means to do so.They hope that visitors who may not have considered themselves collectors will begin to see they,too,collect.
Some collectors say they started or stopped making collections at important points:the beginning or end of adolescence ( 青春期 )-"it's a growing-up thing; you stop when you grow up,"says one.Other painful times are mentioned,such as the end of a relationship.
32.How will the new museums promote a popular culture of museums?C
A.By collecting more tangible things.
B.By correcting what museums normally represent.
C.By showing what ordinary people have collected.
D.By accumulating 40 collections two years from now.
33.What can be learned about collectors from their collections?A
A.Who they are.
B.How old they are.
C.Where they were born.
D.Why they might not mean to collect.
34.Which of the following is an aim of the new museums?C
A.To help people sell their collections.
B.To encourage more people to collect.
C.To study the importance of collecting.
D.To find out why people visit museums.
35.According to the last paragraph,people may stop collecting when theyD.
A.are in their childhood             
B.feel happy with life  
C.are ready for a relationship       
D.become adults.

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