Unit1 Weather Forecasting 1
Unit2 Animal World 19
Unit3 Calamities of Nature 35
Unit4 How Long Can We Still Live？ 57
Unit5 Global Warming 75
Unit6 Plants and Life 96
Unit7 Environment 116
Unit8 Oceanography 136
Unit9 Earthquake and Tsunami 157
Unit10 Forest 177
Key to the Exereises 198