The passage is mainly concerned with the ______. According to the passage, the sensitive plant’s leaves move quickly when parts

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问题 The passage is mainly concerned with the ______.
According to the passage, the sensitive plant’s leaves move quickly when parts of the pulvini ______.

选项 A、drop off
B、become limp
C、revolve
D、twitch

答案B

解析 A死去;B变得柔软、无力;C旋转;D抽动。
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