出版说明
To the Teacher
Steps for the Reader
Vocabulary Words and Definitions
Concept I: Common Needs Create Groups
In Search of Freedom
A Migration to America
Water in the America
Water in the Desert
"Doctors of the Deep"
One Roof,Many People
A New Place to Shop
Together for the Games
A Center of Learning
Earthequake!
Saving Prince William Sound
They Help Others
Photos That Tell Stories
Partners
A Dam with Many Uses
City Planners
Fire Fighters
Presserving the Past
A Mansion for All of US
the Wise Chief
Concept II:Groups Continue Because of Some Benefits
A Capital Bulit to Order
The Wilderness Capital
Monkeys That Look Like Dogs
Help in Time of Trouble
They Benefit the Community
The Many Owners
A Very Large Family
"Children of the Forest"
The Farmers of cades Cove
Their Living Came from the Sea
Ten Wooden Pins
The Heart of a Neighborhood
Mailbags First,Passengers Second
Houses from Factories
A Wpinster's Work
A Congress for the Colonies
Pictures by the Millions
Part-time Actors
The Giant with 100 Eyes
Concept III : The Group Gets Bigger As More Things Share the Benefits
……
Concept IV:When the Size of a Group Gets So Large That Benefits Do Not Reach Its Members,Smaller Groups Are Formed
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