单项选择题

According to the passage, the sensitive plant's leaves move quickly when parts of the pulvini ______.

A．drop off
B．become limp
C．revolve
D．twitch
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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
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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