Researchers have found that REM (rapid eye movement) sleep is important to human beings. This type of sleep generally occurs four or five times during one night of sleep lasting five minutes to forty minutes for each occurrence. The deeper a person's sleep becomes, ~the longer the periods of rapid eye movement.
There are physical charges in the body to show that a person has changed from NREM( non-rapid eye movement) to REM sleep. Breathing becomes faster, the heart rate increases, and, as the name implies, the eyes begin to move quickly.
Accompanying these physical changes in the body is a very important characteristic of REM sleep. It is during REM sleep that a person dreams..
Answer questions according to the essays：
52.The subject of this passage is__.
A.why people sleep
B.the human need for REM sleep
C.the characteristic of REM sleep
D.physical changes in the human body
53.According to the passage,, how often does REM sleep occur in one night? __
C.Four or five times
54.Which of the following shows that a person is NOT dreaming in his sleep?__
A.His eyes begin to move.
B.His breathing-becomes faster.
C.His heart rate increases.
D.His eyes stop moving.
55.The word "deeper" in Paragraph 1 is closest in meaning to which of the following? __
Fill in the following dialogues：
A: Hi, Xiao Wang. Where are you going on vacation?
B: 56 __.
A: Paris? That sounds great! 57 __.
B: We are leaving next Tuesday.
A: Who are you going with?
B: 58 __.
A: 59 __.
B: For about two weeks. 60__.
A : Great ! Wish you a pleasant journey!
B: Thanks a lot.
A.We'll show you our photos when we are back.
B. We are going with our teachers.
C. We are going to Paris.
D. When are you leaving?
E. How long are you going to stay there?
F. Have you been there before?
G. I want to go to London.
H. See you later.
Write an Internet related essay
With the development of computers，the.Internet has become widely used.More and more information will be provided for people.We can get all kinds of useful information in any scientific research field whenever we need.It can help US to enrich our knowledge and help our country to keep up with the developed countries.
However，the Internet also brings US too much information.It always make US very difficult to find something available by browsing many necessary websites.
In a word，we need the Internet.but we should make good use of it.