CONTENTSUNIT 1 A NATION OF PET LOVERS 2
UNIT 2 AN ENGLISH SPEAKING WORLD 16
UNIT 3 THE ELEPHANT 30
UNIT 4 FREEZING A HUMAN BODY 46
UNIT 5 KITES 59
UNIT 6 TUTANKHAMEN'S TREASURE 71
UNIT 7 APES AND LANGUAGE 84
UNIT 8 LIVING ON MARS 98
UNIT 9 WHAT IS LIGHT 112
UNIT 10 TIME TRAVEL 128
UNIT 11 HARRIS AND THE MAZE 142
UNIT 12 ALCOHOLISM：ILLNESS OR WEAKNESS 157