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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热门试题

单项选择题

What is the passage mainly about

A．Amy Johnson's life story as a female flyer.
B．Amy Johnson's great contribution to aviation.
C．Amy Johnson's determination to be a pilot.
D．Amy Johnson's flight to Australia.

单项选择题

According to the passage, what causes potassium and water in the mimosa to shift from some cells to others

A．Signals from the pulvini.
B．Movements of the leaf stalks.
C．Electrical impulses.
D．Nerve signals.