SLEEP
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 Recommended Books Cambridge IELTS 1 Cambridge IELTS 2 Cambridge IELTS 3 Cambridge IELTS 4 … Read more