Unit One The Colorful Language
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Adverbial Clauses （状语从句）
Part Four: Exercises for PRETCO
Unit Two Customs of Communication
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Attributive Clause（定语从句）（1）
Part Four: Exercises for PRETCO
Unit Three Food Culture
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises（单元练习）
Part Three: Grammar Revision: Attributive Clause（定语从句）（2）
Part Four: Exercises for PRETCO
Unit Four Questions of Intelligence
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Participle （分词）（1）
Part Four: Exercises for PRETCO
Unit Five Dreams of Life
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Participle （分词）（2）
Part Four: Exercises for PRETCO
Unit Six Famous People
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Gerund（动名词）（1）
Part Four: Exercises for PRETCO
Unit Seven Average but Respectable Persons
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Gerund（动名词）（2）
Part Four: Exercises for PRETCO
Unit Eight Weather and Climate
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Infinitive （不定式）（1）
Part Four: Exercises for PRETCO
Unit Nine Problems of Education
Part One: Objective of the Unit（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Infinitive （不定式）（2）
Part Four: Exercises for PRETCO
Unit Ten Thanksgiving and Easter
Part One: Objective of the Unlt（单元学习目标）
Part Two: Text Exercises
Part Three: Grammar Revision: Infinitive （不定式）（3）
Part Four: Exercises for PRETCO
Answers
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