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
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
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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