CONTENTS

1．Living Under the Sea

APPENDIX

KEY TO EXERCISES

APPENDIX

2．Our Weather

3．Scientists in Antarctica

4．To the Depths of the Earth

5．Holland's Battles Against Water

6．The World's First Completcly Automatic Railway

7．Searching for Oil in the Sahara Desert

8．Laying the First Sea Cables

9．The Kariba Dam

10．The Saint Lawrence Seaway