Unit 1 Man and Natural Disasters 1
Unit 2 Man and Man-made Disasters 23
Challenging Yourself Ⅰ What Makes Volcanoes 43
Unit 3 History 47
Unit 4 Civilization 66
Chal lenging Yourself Ⅱ Why Do We Learn English Literature 88
Unit 5 Stress and Memory 95
Unit 6 Mysterious Dreams 114
Challenging Yourself Ⅲ Let Your Mind Wander 132
半期检测题 137
参考答案 145
听说部分听力原文 156
单元检测题听力原文 160