托福阅读事实信息题是阅读考试中比较常见的一种题型，tpo则是托福阅读备考最权威的材料，所以托福小编综合二者，为大家集中整理了tpo阅读中考察的事实信息题及其对应的解析，供大家参考使用。本文带来的是TPO13-2的事实信息题，一起来看看吧。
TPO13-2 Biological Clocks
Paragraph 2：
When crayfish are kept continuously in the dark, even for four to five months, their compound eyes continue to adjust on a daily schedule for daytime and nighttime vision. Horseshoe crabs kept in the dark continuously for a year were found to maintain a persistent rhythm of brain activity that similarly adapts their eyes on a daily schedule for bright or for weak light. Like almost all daily cycles of animals deprived of environmental cues, those measured for the horseshoe crabs in these conditions were not exactly 24 hours. Such a rhythm whose period is approximately—but not exactly—a day is called circadian. For different individual horseshoe crabs, the circadian period ranged from 22.2 to 25.5 hours. A particular animal typically maintains its own characteristic cycle duration with great precision for many days. Indeed, stability of the biological clock's period is one of its major features, even when the organism's environment is subjected to considerable changes in factors, such as temperature, that would be expected to affect biological activity strongly. Further evidence for persistent internal rhythms appears when the usual external cycles are shifted—either experimentally or by rapid east-west travel over great distances. Typically, the animal's daily internally generated cycle of activity continues without change. As a result, its activities are shifted relative to the external cycle of the new environment. The disorienting effects of this mismatch between external time cues and internal schedules may persist, like our jet lag, for several days or weeks until certain cues such as the daylight/darkness cycle reset the organism's clock to synchronize with the daily rhythm of the new environment.
6. According to paragraph 2, which of the following is true about the circadian periods of animals deprived of environmental cues?
○ They have the same length as the daily activity cycles of animals that are not deprived of such cues.
○ They can vary significantly from day to day.
○ They are not the same for all members of a single species.
○ They become longer over time.
解析：以circadian做关键词定位至第四句，因为这句话一开始就是一个such，说明可能和上句有联系，读下这两句，说如果没有environmental cue，那么马蹄蟹的period就不是24小时，这个24小时就叫circadian，接着文章又说可能是22.2 to 25.5小时，所以答案是C，同物种的circadian也不一样。此题易错选A，因为以cycle of the environment做关键词定位至倒数第二句，这句之前说生物的内部节律不变，接着说生物的活动不得不因为新环境而发生改变，然后就出现了mismatch，后句中的disorientation就是正确答案。B与原文相反，C和D没说
【2】将小龙虾置于黑暗环境中，即使持续四五个月，它们的复眼也仍然继续按昼夜交替时间来调节视野。人们发现，马蹄蟹可以在黑暗中连续待一年依然能保持连续的大脑周期活动，这与他们的眼睛适应日常交替的强光光与弱光的周期一致。如同大多数失去外界线索的日循环动物一样，马蹄蟹在这种无光的情况下时长也不一定是准确的24小时。这种和一天的循环周期很接近但不完全同步的循环叫做生理节奏。不同的马蹄蟹生理节奏也不一样，在22.2小时到25.5小时之间浮动。有的动物可以将其特有的准确循环时间维持很多天。的确，稳定性是生物钟最重要的特性之一，即使生物所处环境的诸多要素发生显著变化，例如温度可能会对生物活性产生很大影响。通常外部循环发生突变以后，生物钟持续性就会出现进一步的证据，如科研或者横跨东西快速的长途旅行通常，动物日常的周期循环活动仍然会继续并不会发生什么改变。但与此同时，生物活动又因为新环境的外部循环而产生变化。外界时间信号与内部固有的时间表不同步时出现的迷乱的症状，比如飞行时差综合症，我们会因此持续几天活数周,直到某些信号改变之后，比如日照和黑暗循环需要重新设定生物钟并同步到新环境的日常节律之。
7. According to paragraph 2, what will an animal experience when its internal rhythms no longer correspond with the daily cycle of the environment?
○ Disorientation
○ Change in period of the internal rhythms
○ Reversal of day and night activities Increased
○ Sensitivity to environmental factors
解析：以cycle of the environment做关键词定位至倒数第二句，这句之前说生物的内部节律不变，接着说生物的活动不得不因为新环境而发生改变，然后就出现了mismatch，后句中的disorientation就是正确答案。B与原文相反，C和D没说
【2】将小龙虾置于黑暗环境中，即使持续四五个月，它们的复眼也仍然继续按昼夜交替时间来调节视野。人们发现，马蹄蟹可以在黑暗中连续待一年依然能保持连续的大脑周期活动，这与他们的眼睛适应日常交替的强光光与弱光的周期一致。如同大多数失去外界线索的日循环动物一样，马蹄蟹在这种无光的情况下时长也不一定是准确的24小时。这种和一天的循环周期很接近但不完全同步的循环叫做生理节奏。不同的马蹄蟹生理节奏也不一样，在22.2小时到25.5小时之间浮动。有的动物可以将其特有的准确循环时间维持很多天。的确，稳定性是生物钟最重要的特性之一，即使生物所处环境的诸多要素发生显著变化，例如温度可能会对生物活性产生很大影响。通常外部循环发生突变以后，生物钟持续性就会出现进一步的证据，如科研或者横跨东西快速的长途旅行通常，动物日常的周期循环活动仍然会继续并不会发生什么改变。但与此同时，生物活动又因为新环境的外部循环而产生变化。外界时间信号与内部固有的时间表不同步时出现的迷乱的症状，比如飞行时差综合症，我们会因此持续几天活数周,直到某些信号改变之后，比如日照和黑暗循环需要重新设定生物钟并同步到新环境的日常节律.
以上就是托福阅读TPO13-2中的事实信息题及其解析，大家可以在备考的时候参考复习，希望能够帮助大家的考前准备。最后前程百利祝大家都能取得理想的托福考试成绩。
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