1．The Earth's Atmosphere 1
2．Is El Nino Back? 3
3．Wildlife Conservation 5
4．Pets 7
5．William H. Gates Ⅲ 9
6．Alan Greenspan 11
7．To Face the Music 13
8．Rats Have Head for Language 15
9．A Mistaken Rapture 17
10．The Danger of Green Grass Snakes 19
11．London or Paris 21
12．Home on the Road 23
13．Faith and Miracle 25
14．Lie-Detector Camera Looks into Your Eyes 27
15．Rovers on Mars 29
16．The Bermuda Triangle 31
17．Wal-Mart's Rise 33
18．Interracial Marriages 35
19．The Communicative Style of Americans 37
20．What Does It Mean to Be a Living Thing? 39
ANSWER KEYS 41