单选题
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.
【正确答案】
C
【答案解析】
[注释] 第二段第四句This causes potassium．．．中的This指的正是上句中的electrical impulses。
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