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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单项选择题
How long did it take her to fly to Australia
A．17 days.
B．18 days.
C．19 days.
D．20 days.
单项选择题
Argonne believes that people should regard maglev transportation as ______.
A．safe, efficient high-speed trains
B．the most exciting form of transportation for the future
C．a kind of aircraft
D．the most economical form of transportation
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