passage 32 动物睡觉能保证安全吗？

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①Prominent among theories of the function of sleep is Meddis’ immobilization hypothesis, which holds that sleep, rather than serving a restorative function, plays a protective role during times that animals cannot be usefully engaged in other activities. ②Meddis reasoned that animals not immediately threatened by predators would be safer if they passed the time sleeping. ③Sleep would prevent an animal from moving or responding to nonthreatening stimuli in ways that might attract the attention of predators.

①M的观点

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②

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③

①However, that hypothesis cannot easily explain why one often observes a rebound in sleep time or intensity following a period of sleep deprivation. ②Neither does the hypothesis explain the existence of various states of sleep, which themselves maybe associated with different functions.

①+②

For the following question, consider each of the choices separately and select allthat apply.

1. According to the passage, the immobilization hypothesis fails to account forwhich of the following facts?

AB

A. That sleep does not appear to be auniform and unchanging state

B. That under certain conditionsanimals appear to need more sleep than usual

C.That animals rarely sleep when a predator has been detected nearby

2. In the context of the passage as a whole, the highlighted portion serves primarily to

B

A. present the thinking that led scientists to qualify awidely accepted view RE

B. describe the basis on which a hypothesis was advanced (提出)

C. illustrate the kind of reasoning that is applied in a branch of science NE

D. explain how a hypothesis can be tested empirically NE

E. relate the analysis that refined a tentative explanation NE