Đánh giá năng lực Hà Nội
Đánh giá năng lực Hà Nội
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to
Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.
Whether one is awake or asleep, the brain emits electrical waves. During wakefulness, the waves are recorded at about ten small waves per second. With the onset of sleep, the waves become larger and slower. The largest, slowest waves occur during the first three hours of sleep. Mental activity slows down but does not stop. In fact, if awakened from slow-wave sleep, a person can often remember vague thoughts that occurred during that period of sleep.
During sleep, intervals of small, fast waves also occur. These waves are similar to those experienced while awake. The eyes move rapidly, and it appears to the observer that the sleeper is watching some events. Sleepers who are awakened during this rapid-eye-movement sleep will often recall the details of dreams they have been having. Sleep of this kind is called dreaming sleep or rapid-eye-movement sleep, also known as REM sleep.
In a period of eight hours, most sleepers experience from three to five instances of REM sleep. Each instance lasts from five to thirty minutes with in interval of at least ninety minutes between each one. Later instances of REM sleep are usually of longer duration than are instances earlier in the eight-hour period.
People who suffer from sleep deprivation experience fatigue, irritability, and loss of concentration. Sleep is essential because it regenerates the brain and the nervous system. Slow-wave sleep may be especially helpful in restoring muscle control, whereas REM sleep may be more important for mental activity. It appears that both kinds of sleep are necessary, and the recuperation of sleep of one kind will not compensate for a lack of the other kind of sleep.
In which paragraph does the writer describe the benefits of sleep ?
Đáp án đúng là: D
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