单项选择题

It can be inferred from the passage that the mimosa is called the sensitive plant because it ______.

A．reacts to outside stimulation
B．has smaller leaves than most other plants
C．depends on organs called pulvini
D．contains potassium and water
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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
The passage is mainly concerned with the ______.
A．geographical distribution of plant and animal species
B．location and purpose of the pulvini
C．appearance of the mimosa
D．process that causes movement in the mimosa
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