1.The Earth's Atmosphere2.Is El Nino Back?3.Wildlife Conservation4.Pets5.William H.Gates Ⅲ6.Alan Greenspan7.To Face the Music8.Rats Have Head for Language9.A Mistaken Rapture10.The Danger of Green Grass Snakes11.London of Paris12.Home on the Road13.Faith and Miracle14.Lie-Detector Camera Looks into Your Eyes15.Rovers on Mars16.The Bermuda Triang le17.Wal-Mart's Rise18.InterraciaI Marriages19.The Communicativ Style of Americans20.What Does It Mean to Be a Living Thing?ANSWER KEYS
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