当代大学英语 听说交互英语 学生学习课本 第4级PDF电子书下载

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Unit 1 Learning strategies 1

Unit 2 On the way to Australia 31

Unit 3 On vacation 55

Unit 4 Visiting"down under" 87

Unit 5 Good health 111

Unit 6 Talking is good for you! 131

Unit 7 Fire safety 161

Unit 8 How happy are you? 189

Unit 9 Talking about science 213

Unit 10 Nice weather for the time of year! 239

Unit 11 New ideas 271

Unit 12 Truth is stranger than fiction! 295

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