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. 2. 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. 3. 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.
下一篇： 职称英语综合类阅读理解练习题(25)
2017届高考英语一轮复习基础巩固学案：Unit 1《Friendship》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 2《English around the world》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 3《The Million Pound Bank Note》（重大版必修3）
2017届高考英语一轮复习基础巩固学案：Unit 4《Body language》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Unit 2《Learning form Helen Keller》（重大版必修2）
2017届高考英语一轮复习基础巩固学案：Unit 4《Perseverance and Success》（重大版必修3）
2017届高考英语一轮复习基础巩固学案：Unit 4《Astronomy the science of the stars》（重大版必修3）
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅱ《Enjoying Sports》（重大版必修1）
2017高考英语一轮专项训练：完形填空及阅读理解（9）含答案
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅱ《Countries and Regions》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Unit 5《Canada“The True North”》（重大版必修3）
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅲ《Knowing About Houses》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 1《Women of achievement》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Unit 6《Poems and Poets》（重大版必修3）
2017高考英语一轮专项训练：完形填空及阅读理解（4）含答案
2017届高考英语一轮复习基础巩固学案：Unit 1《Favourite Teachers》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 6《Healthy Diet》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 3《A taste of English humour》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅰ《Man and Pets》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Unit 4《Earthquakes》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 1《Learning English》（重大版必修2）
2017届高考英语一轮复习基础巩固学案：Unit 5 Challenging Yourself Ⅲ（重大版选修8）
2017届高考英语一轮复习基础巩固学案：Unit 2《The Olympic Games》（重大版必修2）
2017届高考英语一轮复习基础巩固学案：Unit 1 Challenging Yourself Ⅰ（重大版选修8）
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅰ《Talking About Schools》（重大版必修1）
2017届高考英语一轮复习基础巩固学案：Unit 1《Cultural relics》（重大版必修2）
2017届高考英语一轮复习基础巩固学案：Unit 5 Challenging Yourself Ⅲ（重大版选修7）
2017届高考英语一轮复习基础巩固学案：Challenging Yourself Ⅲ Knowing About Festivals》（重大版必修2）
2017届高考英语一轮复习基础巩固学案：Unit 3《Project Hope》（重大版必修4）
2017届高考英语一轮复习基础巩固学案：Unit 4《Unforgettable Films》（重大版必修1）