54.
What will happen if a person can't have enough sleep?
A.
He will fall ill.
B.
He will feel tired.
C.
His mind will be hurt.
D.
His brain will stop working.
55.
Which of the following statements is TRUE about passive sleep?
A.
The heart beats slowly but the body moves a lot.
B.
The brain is inactive but the heart beats fast.
C.
The body moves a little and the brain becomes active.
D.
The heart beats slowly and the brain is not active.
56.
If the person's eyes move quickly in sleep it means A.
he is in active sleep and dreaming B.
he is in passive sleep and dreaming C.
he is going from active sleep to passive sleep D.
he is going from passive sleep to active sleep 57.
We know from the passage that A.
people who dream a lot can get better rest B.
of the two kinds of sleep, passive sleep is more important C.
one and a half hours' sleep at night is enough for most people D.
both active and passive sleep is necessary to our health