题目内容：

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Even a fifteen-minute burst of light in otherwise sustained darkness can reset an animal's circadian rhythm .
Animals have internal clocks that influence their actitvities even when environmental cues are absent.
The circadian period of an animal's internal clock is genetically determined and basically unchangeable.

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供参考Even a fifteen-minute burst of light in otherwise sustained darkness can reset an animal's circadian rhythm .在原应持续黑暗下,甚至乎是15分钟的阵光能够重新调整1头动物的生理节奏(1). Animals have ...