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 evidence 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.

　　C Decaf drinkers produce less melatonin.

　　D Caffeine drinkers produce less sleep hormone.

　　5. The author of this passage probably agrees that

　　A 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 am.

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