单项选择题

According to the passage, when could people start using a maglev commerciaily

A．In 5 years.
B．In 10 years.
C．In 20 years.
D．In more than 20 years.
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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
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.
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