Late-Night Drinking Coffee lovers beware. Having a quick pick-me-up cup of coffee1 late in the day will play havoc with2 your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample, Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest6 that caffeine blocks production of the enzyme that drives melatonin production. 1. The author mentions pick-me-up to indicate that B neurohormone can wake us up. D decaf is a caffeinated coffee. A Caffeine blocks production of the enzyme that stops melatonin production. C Caffeine halves the bodys levels of sleep hormone. 3. What does paragraph 3 mainly discuss? B Different findings of Lotan Shilo and a team about caffeine. D The proof that the subjects took half an hour to fall asleep. A There are more enzymes in decaf drinkers urine sample. C Decaf drinkers produce less melatonin. 5. The author of this passage probably agrees that B we should not drink coffee after supper. D if we feel sleepy at night, we should go to bed immediately.
新概念英语第一册 Lesson 87:A car crash
新概念英语第一册 Lesson 73:The way to King Street
新概念英语第一册 Lesson 125:Tea for two
新概念英语第一册 Lesson 69:The car race 汽车比赛
新概念英语第一册 Lesson 103:The French test
新概念英语第一册 Lesson 137:A pleasant dream
新概念英语第一册 Lesson 51:A pleasant climate
新概念英语第一册 Lesson 111:The most expensive model
新概念英语第一册 Lesson 99:Owl
新概念英语第一册 Lesson 67:The weekend
新概念英语第一册 Lesson 135: The latest report
新概念英语第一册 Lesson 55:The Sawyer family
新概念英语第一册 Lesson 53:An interesting climate
新概念英语第一册 Lesson 101:A card from Jimmy
新概念英语第一册 Lesson 47:A cup of coffee
新概念英语第一册 Lesson 79:Carol’s shopping list
新概念英语第一册 Lesson 71:He’s awful
新概念英语第一册 Lesson 105:Full of mistakes
新概念英语第一册 Lesson 115: Knock,knock
新概念英语第一册 Lesson 131:Don’t be so sure
新概念英语第一册 Lesson 65:Not a baby
新概念英语第一册 Lesson 75:Uncomfortable shoes
新概念英语第一册 Lesson 93:Our new neighbour
新概念英语第一册 Lesson 59:Is that all
新概念英语第一册 Lesson 107:It’s too small
新概念英语第一册 Lesson 85:Pairs in the spring
新概念英语第一册 Lesson 127:A famous actress
新概念英语第一册 Lesson 121:The man in the hat
新概念英语第一册 Lesson 129:Seventy miles an hour
新概念英语第一册 Lesson 61:A bad cold
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