Unit One Changes in the Way We Live Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Two Civil-Rights Heroes Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Three Security Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Four Extraterrestrials Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Test Yourself（Units1-4） Unit Five How to Celebrate Holidays Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Six The Human Touch Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Seven Making a Living Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Unit Eight Cloning Listening Comprehension Vocabulary and Structure Integrated Comprehension Process Writing Test Yourself（Units 5-8） Appendix
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