Unit 1 Big Bucks the Easy Way
Unit 2 Deer and the Energy Cycle
Unit 3 Why Do We Believe That the Earth Is Round？
Unit 4 Flight 93：What I Never Know
Unit 5 To Lie or Not to Lie——The Doctor's Dilemma
Unit 6 How to Mark a Book
Unit 7 The Luncheon
Unit 8 The New Caves
Unit 9 The Education of a Physicist
Unit 10 Why People Work
Appendix 1 Key to Exercises（Unit 1—Unit 10）
Appendix 2 Chinese Translations of the Texts（Unit 1—Unit 10）
Appendix 3 Chinese Translations of the Reading Passages（Unit 1—Unit 10）
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