单项选择题

For a commuter trip of 500 miles, about how much less fuel would maglev train use compared to a small plane

A．25%.
B．50%.
C．75%.
D．80%.
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单项选择题
What is the best title for this passage
A．The Future of Transportation.
B．Argonne Develops Maglev Train.
C．The Disadvantages of Commuting by Airplane.
D．Commuting in the Future.
单项选择题
According to the passage, when could people start using a maglev commercially
A．In 5 years.
B．In 10 years.
C．In 20 years.
D．In more than 20 years.
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