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General Introduction
总体介绍
Key to Pre-unit Test 1
UNIT ONE
Lesson 1 Finding fossil man
Lesson 2 Spare that spider
Lesson 3 Matterhorn man
Lesson 4 Seeing hands
Lesson 5 Youth
Lesson 6 The sporting spirit
Lesson 7 Bats
Lesson 8 Trading standards
UNIT TWO
Lesson 9 Royal espionage
Lesson 10 Silicon Valley
Lesson 11 How to grow old
Lesson 12 Banks and their customers
Lesson 13 The search for oil
Lesson 14 The Butterfly Effect
Lesson 15 Secrecy in industy
Lesson 16 The modern city
UNIT THREE
Lesson 17 A man-made disease
Lesson 18 Porpooises
Lesson 19 The stuff of dreams
Lesson 20 Snake Poison
Lesson 21 William S.Hart and the early 'Western'film
Lesson 22 Knowledge and progress
Lesson 23 Bird flight
Lesson 24 Beauty
Key to Pre-unit Test 2
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