Three theories about sleep (Reading)

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Complete the following text with the best answer (A, B, C or D):

Three theories about sleep


People spend about one-third of their lives asleep. It seems certain, therefore, that sleep has a (1)____________ function. However, what that function might be is still in (2)__________________. Scientists are far from being in agreement about (3)__________ why so much of our precious time is given over to sleep.

There seem to be three main theories. The most popular states that the functions and (4)__________ of sleep are primarily physiological. It claims that we sleep in order to (5)__________ the health of our body. In other words, biological processes work hard as we sleep to repair any damage done during the day and to restore ourselves to (6)______________ efficiency. However, a second theory places more emphasis on the learning benefits of sleep. This theory holds that sleep allows us to process the information that we (7)___________ during te day, and asserts that, without sleep, learning would not take place. A third popular theory is (8)_________ on ideas about energy, saying that we need (9)__________ of sleep in order to, in a sense, recharge our batteries and so have an adequate supply of energy for the coming day.


1. A. chief      B. vital     C. principal     D. focal
2. A. discussion     B. dispute     C. argument     D. debate
3. A. correctly     B. absolutely     C. actually     D. precisely
4. A. purposes     B. targets     C. intentions      D. points
5. A. take      B. maintain     C. stay     D. keep
6. A. strong     B. utter     C. full     D. entire
7. A. achieve     B. complete     C. reach     D. acquire
8. A. rooted     B. supported     C. based     D. developed
9. A. periods      B. eras     C. moments     D. episodes

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