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完形填空：

　　For years scientists have been arguing about whether nature or nurture(后天)decides what people will be like．Is it nature－what people are 　　1　　 with－ that decides what they will be like?　　2　　 is it nurture－what 　　3　　 to people when they are born －that decides what they will be like?

　　Scientists have been studying twins to 　　4　　 if they can find the answer, because twins start out with the 　　5　　 DNA．Sometimes twins don't live together at birth and grow up in different 　　6　　 and different places－so the nature is the same for both, but the nurture is different．

　　When scientists 　　7　　 these twins in their later life, they some times find some surprising 　　8　　．

　　Jim Springer and Jim Lewis were adopted(收养)by two different families at birth．They first met each other again thirty-nine years 　　9　　 and discovered they had a lot in 　　10　　．Both had been 　　11　　 twice．Their first wives were both named Linda and their second wives were both named Betty!

　　Each twin had a son－one called his son James Alan and the 　　12　　 called his son James Alan, too．Their children each had a dog called “Toy”．They even arrived at their first 　　13　　 in the same color of car．

　　So far twin 　　14　　 seem to show that both nature and nurture are important．What we have from birth, and how and where we live help to build 　　15　　 we are．

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完型填空

　　Everyone needs friends．We all like to 　　1　　 close to someone．　　2　　 is nice to have a friend to talk, laugh, and do things with．　　3　　, sometimes we need to be alone．We don’t always want people 　　4　　．But we would feel lonely if we never have a friend．

　　No two people are 　　5　　．Friends sometimes don‘t get on well．That doesn’t mean they no longer like each other．Most of the time they will make up and become 　　6　　 again．

　　Sometimes friends move away．Then we feel very 　　7　　．We miss them very much, but we can call them and write to them．It could be that we could even see them again．And we can 　　8　　 new friends．It is surprising to find out how much we like new people when we get to know them．

　　There’s more good news for people who have friends．They live longer than people who don’t．Why?It could be that they are 　　9　　．Being happy helps you stay well．Or it could be just knowing that someone cares．If someone cares about you, you take 　　10　　 care of yourself．

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