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-fight commuter aircraft
A．Maglev trains are faster.
B．Maglev trains are cheaper.
C．Maglev trains are more fuel-efficient.
D．Maglev trains are safer.
单项选择题
Which countries have probably spent the most money on maglev research
A．France and West Germany.
B．Japan and West Germany.
C．the United States and Japan.
D．West Germany and the United States.
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