Unit 1 Part One This Was My Mother Part Two Model Test 1 Unit 2 Part One Five Famous Symbols of American Culture Part Two Model Test 2 Unit 3 Part One Are the Americans and the English One Family? Part Two Model Test 3 Unit 4 Part One Of Studies Part Two Model Test 4 Unit 5 Part One Twelve Ways to Democratize the U.S. Political System Part Two Model Test 5 Unit 6 Part One Is Longevity Possible? Part Two Model Test 6 Unit 7 Part One Six Months on: Japan Tsunami Survivor's Story Part Two Model Test 7 Unit 8 Part One How the First Earth Day Came About Part Two Model Test 8 Unit 9 Part One Space Tourism Part Two Model Test 9 Unit 10 Part One Cultural Diversity Part Two Model Test 10 附录 2008年专四真题 2009年专四真题 2010年专四真题 2011年专四真题 2012年专四真题 References