Passage Two-|||-Questions 51 to 55 are hased on the following passage.-|||-Back in 1975,economists plotted rising life expectancies against countries`wealth,and concluded that wealth-|||-itself increases longevit It seemed self -evident:everything peopl need to be healthy-from food to medical care--|||-costs money.-|||-But soon it emerged that the data didn`t always fit that theory. Economic upturns didn`t always mean longer lives.-|||-In addition,for reasons that weren`t clear,a given gain in gross domestic product(GDP)caused increasingly highe-|||-gains in life expectancy over time,as though it was becoming cheaper to add years of life. Moreover,in the 1980s-|||-researchers found gains in literacy were associated with greater increases in life expectancy than gains in wealth were.-|||-Finally,the more educated people in any country tend to live longer than their less educated fellow citizens.But such-|||-people also tend to be wealthier,so it has been difficult to untangle which factor is increasing lifespan.-|||-Wolfgang Lutz and his colleagues have now done that by compiling average data on GDP per person,lifespans,-|||-and years of education from 174 countries,dating from 1970 to 2010.They found that,just as in 1975,wealth-|||-correlated with longevity But the correlation between longevity and years of schooling was closer,with a direct-|||-relationship that did not change over time,the way wealth does.When the team put both these factors into the same-|||-mathematical model, they found that differences in education closely predicted differences in life expectancy,while-|||-changes in wealth barely mattered.-|||-Lutz argues that because schooling happens many years before a person has attained their life expectancy,this-|||-correlation reflects caus better education drives longer life.It also tends to lead to more wealth,which is why wealth-|||-and longevity are also correlated. But what is important,says Lutz, is that wealth does not seem to be driving-|||-longevity,as experts thought-in fact,education is driving both of them.-|||-He thinks this is because education permanently improves a person`s cognitive abilities,allowing better planning-|||-and self-control throughout the rest of their life.This idea is supported by the fact that people who are more-|||-intelligent appear to live longer.-|||-51.What did cconomists conclude about longevity in 1975?-|||-A)Literacy influenced longevity more than wealth did.-|||-B) Wealth itself could increase life expectancy-|||-C)Economic growth didn`t always mean longer life.-|||-D)A given growth in GDP caused higher gains in longevity.-|||-52.Why has it been difficult to decide which factor is increasing lifespan according to Para.2?-|||-A) Because less educated people tend to be richer.-|||-B) Because more cducated people tend to live longer.-|||-C) Because less educated people tend to live longer.-|||-D) Because more educated people tend to be richer.-|||-53.What did Wolfgang Lutz and his colleagues find?-|||-A)Relationship betwcen education and longevity changed over time.-|||-B)Longevity and education were more closely correlated.-|||-C)Differences in wealth predicted differen in longevity.-|||-D) Wealth and longevity did not have any correlation.-|||-54.In which part does education play permanently?-|||-A) It enables people to have better planning and self-control.-|||-B) It always leads to a longer but not necessarily richer life.-|||-C)It helps people acquire time managing and learning habits.-|||-D)It improves people`s imaginative and innovative abilitics.-|||-55.Which of the following is the best title for this passage?-|||-A) The relationship between cducation and wealth-|||-B) Wealth influcnces longevity-|||-C)Education influences longevity-|||-D)Wealth has nothing to do with lo