前言Unit 1 Love and Friendship　Communicative Samples　Paragraph Reading A：Friendship　Paragraph Reading B：Friendship　Grammar Focus：情态动词（一）Unit 2 Customs and Habits　Communicative Samples　Paragraph Reading A：Beliefs and Interests　Paragraph Reading B：Gender Tax　Grammar Focus情态动词（二）Unit 3 Human and the Earth　Communicative Samples　Paragraph Reading A：The Meaning oft he 21st Century　Paragraph Reading B：Imagine Earth without People　Grammar Focus：主谓一致（一）Unit 4 Youth and Dreams　Communicative Samples　Paragraph Reading A：The Autumn the Harvest Season　Paragraph Reading B：The Two Roads　Grammar Focus：评为一致（二）Unit 5 Festivals and Holidays　Communicative Samples　Paragraph Reading A：The Thanks We Give　Paragraph Reading B：The Origins of the April Fool's Day　Grammar Focus：虚拟语气Unit 6 Language and Culture　Communicative Samples　Paragraph Reading A：Proverbs　Paragraph Reading B：What Is the Worth of Words?　Grammar Focus：名词性从句Unit 7 Time and Money　Communicative Samples　Paragraph Reading A：The Value of Time　Paragraph Reading B：Your Money Is Your Life　Grammar Focus:定语从句（一）Unit 8 How to Learn　Communicative Samples　Paragraph Reading A：The Special Joy of Super-slow Reading　Paragraph Reading B：Feed Your Mind　Grammar Focus:定语从句（二）Unit 9 Weather and Climate　 Communicative Samples　Paragraph Reading A：The Weather in Britain　Paragraph Reading B：Weather　Grammar Focus：状语从句（一）Unit 10 Education　Communicative Samples　Paragraph Reading A：In Amy's Eyes　Paragraph Reading B：Culture and Arts　Grammar Focus ：状语从句（二）Unit 11 Traffic and Transmission　Communicative Samples　Paragraph Reading A：The Breakdown Assistance　Paragraph Reading B：A Letter　 Grammar Focus：交际用语习惯达（一）Unit 12 Environment and Conservation　 Communicative Samples　 Paragraph Reading A：The Air Pollutant　 Paragraph Reading B：Greenspace　 Grammar Focus:交际用语和习惯表达（二）GlossaryModel Test 1Model Test 2Answer Keys