1-C. ( Brian McKenzie ( 2014 ) Modes Less Traveled - Bicycling and Walking to Work in the United States: 2008 - 2012 )( Brian McKenzie ( 2014 ) Modes Less Traveled - Bicycling and Walking to Work in the United States: 2008 - 2012 )
2-C. ( Pew Research Center (2008) American Mobility )( Pew Research Center (2008) American Mobility )
(ピュー·リサーチセンター(2008)アメリカン人の移住)
3-C. Here's a table showing the changing number of American readers between 2002 and 2008.Here's a table showing the changing number of American readers between 2002 and 2008.