2015年职称英语理工类教材阅读理解文章及译文(5)_职称英语阅读理解

　　Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.

　　1. The author mentions pick-me-up to indicate that

　　A melatonin levels need to be raised.

　　B neurohormone can wake us up.

　　C coffee is a 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 the hormone that prevents people from sleeping.

　　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 subjects slept 415 minutes per night after drinking decaf.

　　D The proof that the subjects took half an hour to fall asleep.

　　4. What does the experiment mentioned in paragraph 4 prove?

　　A There are more enzymes in decaf drinkers urine sample.

　　B There are more melatonin concentrations in caffeine drinkers urine sample.

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