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
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
举一反三
- 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.
- If a person spends more than 3 hours a day on a mobile phone, then that person is likely to sleep less than 8 hours each night.[input=type:blank,size:4][/input]
- When I ________ less than eight hours of sleep, I feel tired all day.
- How many hours do you need to sleep every night according to the video?
- 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.