Unit 1 That must be a record 1
Unit 2 Crossing limits 11
Unit 3 The land down under 21
Unit 4 Green worlds 31
Unit 5 Getting the message 42
Unit 6 Going west 53
Unit 7 A Christmas Card 65
Unit 8 Learning a foreign language 76
Unit 9 Health care 87
Unit 10 American literature 95
参考答案 106