Unit 1 Part A Significant Events Part B Marvelous Inventions（1） Part C Delightful Moment Unit 2 Part A Great Books Part B Epoch-Making Discoveries Part C Delightful Moment Unit 3 Part A Disasters and Calamities Part B Scientific Giants Part C Delightful Moment Unit 4 Part A Music Part B Scientific Giants（2） Part C Delightful Moment Unit 5 Part A Powerful Empires Part B The French Influence Part C Delightful Moment Unit 6 Part A Titanic Explorations Part B Milestones in Medicine Part C Delightful Moment Unit 7 Part A Arts Part B Marvelous Inventions Part C Delightful Moment Unit 8 Part A Religious Conflicts Part B Architectural Wonders Part C Delightful Moment Unit 9 Part A Wars Part B Prominent Leaders Part C Delightful Moment Unit 10 Part A Supreme Masters of Art Part B The American Impact（1） Part C Delightful Moment Unit 11 Part A Imperialism and Nationalism Part B Milestones in Medicine（2） Part C Delightful Moment Unit 12 Part A World-Famous Writers Part B The British Heritage Part C Delightful Moment Unit 13 Part A Historical Lessons Part B Environment Protection Part C Delightful Monent Unit 14 Part A Advances in Science & Technology Part B The American Impact Part C Delightful Moment Unit 15 Part A Miracles of the 20th Century Part B Education and Sports Part C Delightful Moment
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