What is TRUE of human sleep
A: Most people need less sleep when grow older.
B: Most people need seven and a half hours of sleep every night.
C: On average, people in the U. S. today sleep less per night than they used to.
D: For most people, less than six hours of sleep on a typical work night is enough.
A: Most people need less sleep when grow older.
B: Most people need seven and a half hours of sleep every night.
C: On average, people in the U. S. today sleep less per night than they used to.
D: For most people, less than six hours of sleep on a typical work night is enough.
举一反三
- Two groups of people are compared in the third study. They are people______. A: with less than5 hours of sleep a night and with 7 to 9 hours of sleep B: who slept 4 hours a night and who slept 4 hours for 2 nights C: with less than 4 hours of sleep a night and with 7 to 9 hours of sleep D: with less than 5 hours of sleep a night and with 8 hours of sleep
- Which of the following is Dr. David's opinion A: People who think they are sleeping enough are better off than those who don't. B: Some people can remain vigorous with only 6.5 hours' sleep a night. C: If they get 8.5 hours' sleep, people will be full of drive and ambition. D: People's mental power suffers if they are in sleep deficit.
- How many hours do you need to sleep every night according to the video?
- What's this news about A: A new find that people who sleep less tend to be fat. B: A new find that people who sleep less tend to be thin. C: A new find that more sleep will result in obesity. D: A new find that women should sleep less.
- Why is the question of "how easily people can get used to working at night" not a mere academic question A: Because few people like to reverse the cycle of sleep aud wakefulness. B: Because sleep normally coincides with the hours of darkness. C: Because people are required to work at night in some fields of industry. D: Because shift work in industry requires people to change their sleeping habits.