Do you know why you sleep? You may think it's because you're tired. Or perhaps you've been told sleep is good for you. Yet no one knows exactly why or how people sleep. Until the early 1950s, most scientists thought the body and brain rested during sleep. Then a scientist watched people sleep. He noticed that during periods of between 5 and 30 minutes each, sleepers' eyes made rapid movements, as if they were watching something. He called these periods REM sleep, for Rapid Eye Movement. Periods when sleepers' eyes did not move he called non-REM sleep. Whenever the scientist woke people during REM sleep, they were having vivid dreams. Measurements showed that sleepers' pulses went up quickly during REM sleep. Their breathing, heartbeat, and the blood going to the brain also increased. Far from being a time of rest, REM sleep is a time when the body is hard at work. Scientists still don't know the reason for this. Some believe REM sleep makes learning easier. Babies spend a lot of time in REM sleep. Because of this, some scientists believe that REM sleep helps the brain grow. Others think REM sleep is a time for the brain to empty the day's garbage. One thing all the scientists agree on is that sleep is necessary. Without enough sleep, people make mistakes. Most major car accidents happen during the early morning hours, when people are sleepiest. What is the main idea of the article? A) REM sleep helps the brain grow. B) REM sleep has been watched and recorded by scientists. C) REM sleep is a time to empty the day's garbage. D) REM sleep is an active time when the body is hard at work.
B
From age eight to eleven, I studied at a small school in Bath, England. It was a small school of four classes, with about twenty-five children in each class according to age. For the most part, one teacher had to teach all subjects. However, sometimes the headteacher , Mr. Ronald Broaches would come in and spend an hour or so. He was a large man with a very happy nature. He had a sense of humor and would be glad in telling the children small stories which make us laugh. I found that he took great interest in me and he quickly found that I enjoyed puzzles. He would stop me as I was going to class and take a piece of paper out of his pocket, often with a puzzle on it. As time went on, they slowly gave me an interest in math and problem -solving that stays with me to this day. To this day, I can remember Mr. Broaches' cheerful cry of "Well done!" whenever I got a problem right. I shall always be thankful that our paths crossed. Mr. Bruoaches died just two weeks after I won the 1993 Nobel Prize in Physiology and Medicine. Unfortunately, I had no chance to speak to him before he died. I learnt late that he had heard of my success and I will always hope that he knew the deep influence he had made on my life. The writer felt sorry because _ . A) Mr. Broaches passed away before he won the Nobel Prize B) he didn't express his thanks before Mr. Broaches died. C) he couldn't find Mr. Broaches after he grew up D) Mr. Broaches didn't know about his success.
B
Q: If you knew you had only three years left to live, how would you use your time? It's a hard question and few of us would even like to think about it. But 18-year-old Huang Ge has to answer this question and he says, "I want to thank the people who have helped me." At the age of one, Huang's mother left the family. Six years later, he was badly ill. He has been using a wheelchair since 9 years old. Doctors said he would only live to be 18. After Huang's story went on TV, hundreds of Chinese sent money to help him. The boy was so moved that he decided to thank everyone of them. But it is not an easy job, because Huang was too sick even to drive a mosquito away from his leg. Huang has to be tied to his wheelchair to stop him from falling out. And the family can only afford a three-wheeled motorcycle . Since 2003, the father and son have traveled 14,000 kilometers to 10 provinces, and thanked more than 30 helpers. "I am moved by the story of this boy. We need the courage to face death, and we should also feel the thankfulness for those who help us," reads an online article on CCTV,com. They _ to thank the helpers. A) took a train B) took a ship C) took a motorcycle D) took a bus
A: C
Question: There are many kinds of animals in the zoo. Look! There are two lions. They are very big and smart. Near them there is a small elephant. She is from Africa. She likes to eat grass. Oh, is there a koala? Of course. There is a two-year-old koala. He always sleeps in the day and at night he gets up and eats leaves. I like pandas best. There is one in the zoo. She is five years old. She is very beautiful, but she's very shy. Do you like her? What animals are in the zoo? A) Lions B) An elephant C) A panda D) All the above
Answer: D
*Question*
This is a reading room in Kate's school. It is big and very nice. There is a lot of furniture in it. There are twenty desks, eighty chairs and twenty computers. There're some pictures on the wall. They are all of famous people. Some students are in the reading room. They like reading books here. Kate is here too. Her mother is an English teacher at the school and her father is a doctor in the school hospital. They like reading books in the reading room too. Kate's father is _ . A) an English teacher B) a hotel manager C) a doctor D) a famous people
**Answer**
C
The students were having their chemistry class. Miss Li was telling the children what water was like. After that, she asked her students, "What's water?" No one spoke for a few minutes.Miss Li asked again,"Why don't you answer my question?Didn't I tell you what water is like?" Just then a boy put up his hand and said,"Miss Li,you told us that water has no color and no smell.But where to find such kind of water?The water in the river behind my house is always black and it has a bad smell."Most of the children agreed With him. "I'm sorry,children."said the teacher,"Our water is getting dirtier and dirtier.That's a problem". Most of the children _ the boy. A) agreed with B) wrote to C) heard from D) sent for
A