Unit One

Big Bucks the Easy Way

Unit Two

Deer and the Energy Cycle

Revision Exercises 1

Unit Three

Why Do We Believe That the Earth Is Round?

Jim Thorpe

Unit Four

Revision Exercises 2

Unit Five

To Lie or Not to Lie--The Doctor s Dilemma

Unit Six

How to Mark a Book

Revision Exercises 3

Unit Seven

The Luncheon

The New Cave

Unit Eight

Revision Exercises 4

Unit Nine

Journey West

Unit Ten

Why People Work

Revision Exercises 5

Test Paper 1

Test Paper 2

Keys to Revision Exercises 1

Appendix I

Keys to Revision Exercises 2

Keys to Revision Exercises 3

Keys to Revision Exercises 4

Keys to Revision Exercises 5

Appendix Ⅱ

Keys to Test Paper 1

Keys to Test Paper 2