文档介绍：2010:.(s)D1.(10)Mexicoa11,,Chile.“4”..’.,1020091112.(A),.[A][B][C][D]2.[A][B][C][D]3.[A][B][C][D]4.[A][B][C][D]5.[A][B][C][D]6.[A][B][C][D]7.[A][B][C][D]8.[A][B][C][D]9.[A] [B] [C][D]10.[A] [B][C][D]11.[A][B][C][D]12.[A][B][C][D]13.[A] [B][C][D]14.[A][B][C][D]15.[A][B][C][D]16.[A][B][C][D]17.[A][B][C][D]18.[A][B][C][D]19.[A][B][C][D]20.[A][B][C][D]ⅡA:.A,B,.(40)1aaa56,“”,’s152008().,￡70m,.,,,.$65,,,a.$50.,,,a.’s,,,..,90%2008.’s,’s’s,$,%,.,’s,:“I’m’.”,,,1990s,,.’.,.,.21's“a”.a22“”(1-).?A20072008....24'252IaaVirginiaa's..I't.."'s.";."'s"."II.'t'd.".  .'70s."".:"'t""'t."'?...D..27“”().?....,--.,,a.“,,’t’s,”..“.”.-&,-’.,’-,,,,,,,,,,-.A,a.,,aa,,.A,’ta..,,aa..“,”,a&,$76,.“a’,’s.”,..,.31.[A][B][C][D]325[A]’[B][C]’[D]33’s?[A][B][C][D]34’s[A][B][C][D]35’’s[A][B][C][D]4a,;a;a,,,;;..a,,.1986,.,,,,...,,,,.[A][B][C][D]371968[A][B][C]381960[A][B][C][D]39[A][B][C][D]40US[A][B][C][D] .(10).,,a.,,.1914,.a’.,.,Universitya25a71%.,.,IUtah,a,%(a).a.,,.,.?,,A.,aa..,’..a.,,,.,America’s.’s,..“aLancasterBerlin,”....43..44..45.Ⅱ,’s.Ⅲ46:.(15)“”,,..1990s.’daBoulder.’t.“a’s,”,,,a.“I,.,‘,’,.’”ⅣA47.:.);2)..“”..(10)2011I :.(s)A,B,CD1.(10),a.  1 .  2   a  3   ?,,’s,a  4  a“”  5  a,aa,  6  .a,a  7  aa.  8  a.  9  ,.’s      10    .“”    11  .  12 a“”n,“”“”aa   13  ..a“”“  14    15  ”.,’s  16  .;.a  17  a“’s”.  18  ,“”.  19    20  ,..  ReadingA:.A,B,.(40)1’s2000:aBrownUniversity..2009.’s;?..,.,,a’s.,’s.,,.OhioUniversitya10,00064,00019892004..a,“”,20%.a,..a,a.“.”,.aa,a...,.,.[A] [B][C][D].[A] [B][C] [D]’s,.[A][B][C][D]24..[A][B][C][D]25.’s.[A] [B] [C] [D]2?A...America’sa.??....,,.20%a,...13