| READING PASSAGE 3 | |
| 27 | D |
| 28 | A |
| 29 | C |
| 30 | B |
| 31 | light sleep |
| 32 | brain |
| 33 | smaller, faster waves |
| 34 | deep sleep |
| 35 | breathing |
| 36 | deteriorate |
| 37 | metabolic rate |
| 38 | torpor |
| 39 | day-night cycle |
| 40 | circadian rhythm |
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