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1、 2022年英语职称考试理工类C级阅读十四Late-night drinkingCoffee lovers beware. Having a quick “ pick-me-up” cup of coffee late in the day will play havoc with you sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that send people into a sleep.Melatonin levels normally
2、start to rise about two hours before bedtime. Levels then peak between 2 a.m. and 4 a. m , before falling again. “Its the neurohormone that controls our sleep and tells our body when to sleep and when to wake,” says Maurice Ohayon of the Stanford Sleep Epidemiklogy Research Center at Stanford Univer
3、sity in California. But researchers in Israel have found that caffeinated coffee halves the bodys levels of this sleep hormone.Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the
4、 same amount of decaf. On average, subjects slept 336 minutes per night after drinking caffeinated coffee,compared with 415 minutes after decaf .They also took half an hour to drop off-twice as long as usual-and jigged around in twice as much.In the second phase of the experiment, the researchers wo
5、ke the volunteers evey three hous and asked them to give a urine sample. Shilo measured concentrations of abreakers were half those in decaf drinkers. The results suggest that melatonin concentrations in caffeine drinkers were half those in decaf drinkers. In a paper accepted for publication in Slee
6、p Medicine, the researchers suggest that caffeine blocks production of the enzyme the drives melatonin production.Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.练习：1. The author mentions“pick-me-up” to indicate tha
7、tA) melatonin levels need to be raised.B) Neurohormone can wake us up.C) Coffee is stimulant.D) Decaf is a caffeinated coffee.2. Which of the following tells us how caffeine affects sleep?A) Caffeine blocks production of the enzyme that stops melatonin production.B) Caffeine interrupts the flow of s
8、leep hormone.C) Caffeine halves the bodys levels of sleep hormone.D) Caffeine stays in the body for many hours.3. What does paragraph 3 mainly discuss?A) Different effects of caffeinated coffee and decaf on sleep.B) Different findings of Lotan Shilo and a team about caffeine.C) The fact that the sub
9、jects slept 415 minutes per night after drinking decaf.D) The evidence that the subjects took half an hour to fall asleep.4. What does the experiment mentioned in paragraph in paragraph 4 prove?A) There are more enzymes in decaf drinkers urine sample.B) There are more melatonin concenrrations in caf
10、feine drinkers urine sample.C) Decaf drinkers produce less melatonin.D) Caffeine drinkers produce less sleep hormone.5. The author of this passage probably agrees thatA) coffee lovers sleep less than those who do not drink coffee.B) We should not drink coffee after supper.C) People sleep more soundly at midnight than at 3 a.m.D) If we feel sleepy at night, we should go to bed immediately.答案：C C A D B
