单项选择题

The major problems with America's railroad system in the mid 19th century lay in ______.

A．poor quality rails and unreliable stopping systems
B．lack of financial support for development
C．limited railroad lines
D．lack of a transcontinental railroad

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单项选择题

LOGO is ______.

A．an education testing program
B．a computer language
C．an information dispenser
D．an unreal world

单项选择题

The best title for this passage would be ______.

A．Children Rule the World
B．Children Learn Reasoning Using LOGO
C．Computer Languages
D．The Unreal World of the Child and the Computer