单项选择题
A．Settlements Spread Westward B．The Coast-to-Coast Railroad: A Vital Link C．American Railroad History D．The Importance of Trains in the American Economy
A．Children Rule the World B．Children Learn Reasoning Using LOGO C．Computer Languages D．The Unreal World of the Child and the Computer
A．compare LOGO with other computer programs B．explain how LOGO works C．discuss children's imaginations D．identify the children who use LOGO