Unit One E-mail Phories 1
Unit Two Life Fields 10
Unit Three Endangered Species 19
Unit Four Computer Viruses 29
Unit Five Dolly,You re History 38
Unit Six Heat 47
Unit Seven Oil Spill Prevention 57
Unit Eight Get Ready for Some Wild Weather 66
Unit Nine How Safe Is Your Water 75
Unit Ten AIDS——Acpuired Immune Deficiency Syndrome 85
Unit Eleven Cancer 94
Unit Twelve Mercury 107
Unit Thirteen Mental Illness 117
Unit Fourteen Antilock Brakes:A Potential Lifesaver 129
Unit Fifteen Raising Children s Intelligence 139
Unit Sixteen The Chemistry of Cleaning Clothes 148
Unit Seventeen The Origin of Air 161
Unit Eighteen Uses of Computers in Research 175
Unit Nineteen Carbon Monoxide Detectors 187
Unit Twenty The Plight of the Bumblebee 200
Key to the Exercises 212