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.
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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%.
单项选择题
According to the passage, when could people start using a maglev commercially
A．In 5 years.
B．In 20 years.
C．In 10 years.
D．In more than 20 years.
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