目录：
Unit One My Pets
Lesson One
Lesson Two
Review One
Unit Two Zoo Animals
Lesson Three
Lesson Four
Review Two
Unit Three Farm Animals
Lesson Five
Lesson Six
Review Three
Unit Four My Toys
Lesson Seven
Lesson Eight
Review Four
Unit Five Meals in a Day
Lesson Nine
Lesson Ten
Review Five
Unit Six Dinner Time
Lesson Eleven
Lesson Twelve
Review Six
Words and Expressions in Each Unit
Word List
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