Question

阅读理解一篇，会的帮忙解答下，谢谢啦！~

Passage 2
As we know, sleep is necessary to everyone. If we don’t sleep well enough, we’ll feel tired.
Each night we have two kinds of sleep: active sleep and passive sleep. The passive sleep gives our body the rest and prepares us for active sleep, in which dreaming appears. In passive sleep, the body is at rest. The heart slows down. We move very little. And the brain becomes inactive. If a person continues to sleep, the brain temperature rises, the amount of blood in the brain increases, the body becomes very, very still, and the brain goes from being inactive to being active. And as the brain becomes more active, the eyes begin to move rapidly. This is sign of another change—the change is that a person is dreaming.
Many people say that they don’t dream, or that they seldom dream. That’s not true. Scientists have found that everyone dreams for about one and a half hours a day, and that everyone dreams from three to seven times a night, though in ordinary life a person may remember none or only one of these dreams. In fact, everyone needs passive sleep in order to rest his body, everyone needs active sleep in order to rest his mind, and everyone needs to dream in order to keep healthy.
46. When dreaming appears, we are in ___.
A. active sleep B. passive sleep
C. inactive sleep D. neither active nor passive sleep
47. The eyes won’t move when a person sleeps unless ___.
A. he is about to wake up B. he is looking at something
C. he dreaming D. he wants to open his eyes
48. Dreaming helps to make ___.
A. our bodies move B. our minds rest
C. our hearts beat slowly D. us sleep well
49. Scientists have discovered that ___.
A. a person dreams only one dream a night
B. a dream usually takes an hour and a half
C. everyone dreams every night
D. only active sleep is necessary to every one of us
50. Which of the following is NOT true?
A. Everyone needs active sleep. B. Everyone needs passive sleep.
C. Dreaming is bad to health. D. Dreaming is necessary to our health.

Answer 1

46. A ( for active sleep, in which dreaming appears)
47. C (And as the brain becomes more active, the eyes begin to move rapidly. This is sign of another change—the change is that a person is dreaming. )
48. A ( If a person continues to sleep, the brain temperature rises, the amount of blood in the brain increases, the body becomes very, very still, and the brain goes from being inactive to being active. And as the brain becomes more active, the eyes begin to move rapidly. This is sign of another change—the change is that a person is dreaming.)
49. C ( Scientists have found that everyone dreams for about one and a half hours a day, and that everyone dreams from three to seven times a night, though in ordinary life a person may remember none or only one of these dreams. )
50. C (and everyone needs to dream in order to keep healthy )