关键期这一概念来自于动物习性学家所提出的“（）”。
正确答案：印刻
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单项选择题
If you tend to regularly suffer from a certain symptom like headache, be sure to keep in store the _______ medicine to take care of the issue as soon as it starts.
If you tend to regularly suffer from a certain symptom like headache, be sure to keep in store the _______ medicine to take care of the issue as soon as it starts.
A．efficient
B．concise
C．appropriate
D．secure