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Unit 1 Travelling 1
Unit 2 Space 8
Unit 3 Animals 16
Unit 4 Scientists 23
Unit 5 Sports 31
Unit 6 Water 39
Unit 7 Holidays 48
Unit 8 Learning a Language 56
Unit 9 Foreign Countries 65
Unit 10 The Internet 74
Test A 83
Test B 90
参考答案 97