单项选择题

The construction of the transcontinental railroad took()

A．9 years
B．4 years
C．7 years
D．3 years

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单项选择题

The best title for this passage would be ()

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

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