Ⅰ．Workbook

Unit One Environment Report

——Aluminum

——Dyslexia

Unit Thre e The Making of a Nation(1)

Unit Four The Making of a Nation(2)

Unit Five The Making of a Nation(3)

Unit Six Science Report——Cancer

Unit Seven Space and Man——Diabetes(1)

Unit Eight Space and Man——Diabetes(2)

Unit Nine Space and Man——Diabetes(3)

Unit Ten The President's Cabinet

Unit Eleven Environment Report——The Giant African Land Snail

Unit Twelve Science in the News——Depression(1)

Unit Thirteen Science in the News——Depression(2)

Unit Fourteen Science in the News——Depression(3)

Ⅱ．Suggested Keys to the Exercises

Ⅲ．Tapescript

Unit One

Unit Two

Unit Three

Unit Four

Unit Five

Unit Six

Unit Seven

Unit Eight

Unit Nine

Unit Ten

Unit Eleven

Unit Twelve

Unit Thirteen

Unit Fourteen