Unit One

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Two

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Three

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Four

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Five

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Six

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Seven

Objectives

Teaching Process

Key to the Exercises

参考译文

Unit Eight

Objectives

Teaching Process

Key to the Exercises

参考译文