目录：
Unit 1 Jenny's Winter Space Camp
Unit 2 Traveling in China
Unit 3 Finding the Way
Unit 4 Review
Unit 5 Say It without Words
Unit 6 Culture Quiz
Unit 7 What's in the Ads?
Unit 8 Review
Unit 9 Different Cultures
Unit 10 Different Kinds of English
Unit 11 Across Generations
Unit 12 Review
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