**单元
Changes in the Way We Live
Text A Mr.Doheryt Builds His Dream Life
Text B American Family Life:The Changing Picture
第二单元
Civil-Rights Heroes
Text A The Freedom Givers
Text B The Dream,the stars and Dr.King
第三单元
Security
Text A The Land of the Lock
Text B Why I Bought a Gun
第四单元
Extraterrestrials
Text A The Watery Place
Text B Is There Life on Plants Circling Other Stars?
第五单元
How to Celebrate Holidays
Text A Writing Three Thank-you Letters
Text B Where is Home?
第六单元
The Human Touch
Text A The Last Leat
Text B Thank you ,Ma'm
第七单元
Making a Living
Text A Life of a Salesman
Text B Bricklayer's Boy
第八单元
Cloning
Text A A Clone Is Born
Text B Second Thoughts on Cloning