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 a.m.
D. if we feel sleepy at night, we should go to bed immediately.
Pool Watch
Swimmers can drown in busy swimming pools when lifeguards fail to notice that they are in trouble. The Royal Society for the Prevention of Accidents says that on average 15 people drown in British pools each year, but many more suffer major injury after getting into difficulties. Now a French company has developed an artificial intelligence system called Poseidon that sounds the alarm when it sees someone in danger of drowning.
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