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According to the passage, the sensitive plant's leaves move quickly when parts of the pulvini ______.A.drop offB.become limpC.revolveD.twitch

A.A.drop
B.become
C.revolveD.twitch

【参考答案】

B

[注释] A死去；B变得柔软、无力；C旋转；D抽动。

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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.

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It can be inferred from the passage that the mimosa is called the sensitive plant because it ______.A.reacts to outside stimulationB.has smaller leaves than most other plantsC.depends on organs called pulviniD.contains potassium and water