Life Span About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives fo

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答案 Life Span About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives for around seventy-eight years. /What accounts for such increased longevity? /Between 1900 and 1950, inventions such as refrigeration and sewage treatment meant that/young people were able to survive longer. /Moreover, medical breakthroughs helped contain diseases/such as some fatal ones that killed many children. /These advances helped increase the average life span. /This means that future medical breakthroughs will result in even longer average life span.

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专业英语四级

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Life Span About a century ago, the average life span for Americans was about 50 years. /Today, the typical American lives fo

专业英语四级

Tomisimmenselycuriousabouteverythingandaseagertofindtheanswersasifhe______dealingwiththesubjectforthefirst

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Thediscoveryofnewoil-fieldsinvariouspartsofthecountryfilledthegovernmentwith______hope.

______touchinginO’Henry’sstoriesisthegallantrywithwhichordinarypeoplestruggletomaintaintheirdignity.

A、GotoRussiaagaininseveralyears.B、Gotoanothercountrysoon.C、DosomebusinesswithRussians.D、Becomeatourguidein

A、Shehasn’tchangedalot.B、ShewenttoAmerica4yearsago.C、Shehasknownthemanfor10years.D、Thelasttimeshesawthe

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TheDifferencesBetweenAmericanandBritishEnglishI.IntroductionAmericanEnglishandBritishEnglish:thetwo【T1】ofEnglis

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狂犬病是一种对人、畜危害很大的传染病，人、畜主要是通过被发病犬咬伤，感染上病毒而发病的，发病后无一例外地死亡。医学研究表明：被病犬咬伤后二十四小时内注射狂犬疫苗，可大大降低发病机会。由此可知()。

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