【阅读理解IntheCaucasus(高加索)regionoftheSovietUnionnearly50outofevery100000peoplelivetocelebratetheir100thbirthdayandmanydon’tstopat100!BycomparisoninA】

　　阅读理解

　　IntheCaucasus(高加索)regionoftheSovietUnionnearly50outofevery100000peoplelivetocelebratetheir100thbirthdayandmanydon’tstopat100!BycomparisoninAmericanonly3peopleoutof10000reach100．ButtheseSovietoldpeoplearen’talone．ThePakistaniHunzaswholiveintheHimalayaMountainsandtheUilcabambansoftheAndesMountainsinEcuadorseemtosharethesecretoflonglifetoo．Thesepeoplesremainhealthyinbodyandspiritdespitethepassageoftime．Whilemanyelderpersonsinindustrialsocietiesbecomeweakandillintheir60sand70ssomeGeorgiansaged110to140workinthefieldsbesidetheirgreatgreatgrandchildren．Eventheideaofagingisforeigntothemwhenasked“atwhatagedoesyouthend?”mostoftheseoldpeoplehadnoanswer．Severalreplied“wellperhapsat80”theveryyoungestestimatewasage60．

　　Whataccountsforthisabilitytosurvivetosucholdageandtosurvivesowell?Firstofallhardphysicalworkisawayoflifeforalltheselonglivedpeople．Theybegintheirlongdaysofphysicallaboraschildrenandneverseemtostop．

　　Allthesepeoplegethealthfulrewardsfromtheenvironmentinwhichtheywork．Theyallcomefrommountainsregions．Thisreducedoxygenenvironmentmakestheheartandbloodvesselsystemstronger．

　　Anotherfactorthatmaycontributetothegoodhealthofthesepeopleistheirisolation．Toagreatextenttheyareseparatedfromthepressuresandworriesofindustrialsociety．Inheritedfactorsalsoplaysomerole．

　　(1)

　　Whydoesthewritermentionsomelonglivedpeopleinthefirstparagraph?

　　[]A．

　　Tosurprisehisreaders．

　　B．

　　Tointroducethesubjectofthearticle．

　　C．

　　TotellyouthedifferencebetweenpeopleintheSovietUnionandAmerica．

　　D．

　　TotellyouwhyAmericansdon’tliveaslongasotherpeople．