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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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
How was her flight to Australia
A．Dangerous.
B．Difficult.
C．Unpleasant.
D．Pleasant.
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