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.
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单项选择题
Why could maglev trains replace short-flight commuter aircraft
A．Maglev trains are faster.
B．Maglev trains are more fuel-efficient.
C．Maglev trains are cheaper.
D．Maglev trains are safer.
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．75%.
C．50%.
D．80%.
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