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.
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.
- Why does a lack of sleep cause people to gain weight A: Because people burn fewer calories when they are awake. B: Because people feel hungry when they lack sleep. C: Because their hormones stay unchanged. D: Because people don"t exercise when they don"t have enough sleep.
- Why do Americans like to go to fast food restaurants? A: It is because fast food restaurants are fast, informal, and inexpensive. B: It is because people can easily find fast food restaurants C: It is because people like to eat hamburgers. D: It is because fast food restaurants sell nearly every kind of food.
- Some people really like to get up early in the morning. They enjoy being awake (醒来) before the mst of the world. They also get a lot of work done early in the day. We call these kinds of people morning people. Other people like to sleep late. They enjoy being awake at night when the mst of the world is sleeping. They get a lot of work done late at night. These people are called night owts (猫头鹰). Morning people have ______ early in the day. A: a meeting B: much work to do C: exercise to do
- Why was the death regarded silent A: Because it's quiet after an explosion, B: Because the people were killed outright. C: Because when it came, the victims were in sleep, D: Because it happened suddenly.
内容
- 0
If a language is not used by people， it is called a dead language。 A dead language cannot live and grow （ ）。 A: because no one speaks it B: because only a few speak it C: because people don’t think it useful D: because too many people use it
- 1
Why is a mid-morning break more beneficial to workers than a mid-afternoon break A: Because it helps people get concentrated when they get distracted. B: Because it makes people feel energetic when they are tired. C: Because it makes people feel vigorous before the midday lull sets in. D: Because it boosts motivation before people get sleepy.
- 2
Because it was too dark at night, I could see ______ people on the street. A: few B: a few C: C. little D: a little
- 3
Nowadays people work hard because ________. A: they want to get ahead B: they don't want to get sacked C: they enjoy working so much D: they believe work is virtuous
- 4
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.