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
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
单项选择题
Writing stories and articles ______ what I'm fond of.
A．is
B．were
C．are
D．have been
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