Unit A Business Letter
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 2 Effective Use of Land
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 3 Yellowstone National Park
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 4 My Friend, Albert Einstein
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 5 Americans:A Definition
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 6 On Reading
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 7 Walking in Space
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 8 A Seven.Dollar Dream
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit9 A Fable for Tomorrow
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
Unit 10 A Wing and a Prayer
Background Knowledge(背景知识)
Detailed Notes to the Text(课文详解)
Key to Exercises(参考答案)
Chinese Translation(课文参考译文)
English Proficiency Tests
Key to English Proficiency Tests