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CONTENTS 1

1．Living Under the Sea 1

APPENDIX 1

KEY TO EXERCISES 2

APPENDIX 2

2．Our Weather 18

3．Scientists in Antarctica 32

4．To the Depths of the Earth 46

5．Holland's Battles Against Water 61

6．The World's First Completcly Automatic Railway 75

7．Searching for Oil in the Sahara Desert 91

8．Laying the First Sea Cables 115

9．The Kariba Dam 140

10．The Saint Lawrence Seaway 164

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