1.The Earth\'s Atmosphere 2.Is El Nino Back? 3.Wildlife Conservation 4.Pets 5.William H.Gates III 6.Alan Greenspan 7.To Face the Music 8.Rats Have Head for Language 9.A Mistaken Rapture 10.The Danger of Green Grass Snakes 11.London or Paris 12.Home on the Road 13.Faith and Miracle 14.Lie-Detector Camera Looks into Your Eyes 15.Rovers on Mars 16.The Bermuda Triangle 17.Wal-Mart\'s Rise 18.Interracial Marriages 19.The Communicative Style of Americans 20.What Does It Mean to Be a Living Thing? ANSWER KEYS
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