3、D【解析】文章第二段明确指出，不仅植物，动物也有“生物钟”（inner clock），而且人，同样受“内在力量”的支配。所以，一切有生命的东西，都有其特定的“生物钟”存在。
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The Inner Sleep Clock 睡眠生物钟 ; 内在睡眠时钟
If you are in a relationship that seems to be stagnating, your inner clock will likely begin to sound an alarm this month.
如果你正在谈恋爱，似乎停滞不前，你可能会开始生物钟本月发出警报。
Yet, faced with sustained challenges like the BP oil spill, Obama has struggled to calibrate his inner clock and rouse himself to palpable intensity and action.
不过，在面对类似BP石油泄漏这样的持续性难题时，奥巴马在努力适应并唤起斗志和行动方面有些力不从心。
Jet lag is the best known circadian rhythm disorder, but this sensitive inner clock can also be disrupted by changes in routine resulting in an erratic sleep schedule.
时差是我们最为熟悉的生理节奏失调现象，但敏感的生物钟还会因我们睡眠时间不稳定而陷于混乱。
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