Unit 1 Space Exploration 1
Ⅰ．Teaching Content 1
Ⅱ．Key to Exercises 14
Ⅲ．Translation of the Texts 27
Unit 2 Energy 31
Ⅰ．Teaching Content 31
Ⅱ．Key to Exercises 43
Ⅲ．Translation of the Texts 53
Unit 3 Gender Differences 56
Ⅰ．Teaching Content 56
Ⅱ．Key to Exercises 65
Ⅲ．Translation of the Texts 79
Unit 4 Information Security 83
Ⅰ．Teaching Content 83
Ⅱ．Key to Exercises 91
Ⅲ．Translation of the Texts 100
Unit 5 Future Vehicles 104
Ⅰ．Teaching Content 104
Ⅱ．Key to Exercises 114
Ⅲ．Translation of the Texts 125
Unit 6 Skyscrapers 128
Ⅰ．Teaching Content 128
Ⅱ．Key to Exercises 134
Ⅲ．Translation of the Texts 144
Unit 7 Animal Behavior 147
Ⅰ．Teaching Content 147
Ⅱ．Key to Exercises 154
Ⅲ．Translation of the Texts 165
Unit 8 Natural Disasters 168
Ⅰ．Teaching Content 168
Ⅱ．Key to Exercises 182
Ⅲ．Translation of the Texts 193