题目内容
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（脉搏）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.
【小题1】During REM sleep, a person’s breathing and heartbeat ________.
| A．stop | B．increase | C．decrease | D．stay the same |
| A．easier | B．empty | C．vivid | D．quickly |
| A．1 | B．2 | C．3 | D．4 |
| 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. |
| A．has a restful effect on people |
| B．can be avoided with lots of sleep |
| C．is something that all people experience |
| D．is something that all scientists agree on |
【小题1】B
【小题1】C
【小题1】D
【小题1】B
【小题1】A解析:
略
阅读快车系列答案You may know the song Happy Birthday very well. But do you know about its writer? It was written by an American girl. And she became very rich after that.
When she was a child, she was poor. Once, she was invited to her friend’s birthday party. She was pleased but sad because she didn’t have enough money to buy a gift for her.
“The party is coming soon, but now I have little money.” Tears ran down her face.
Later that night she was in bed, thinking about the gift when the door opened and her grandma came in.“ What happened? ” her grandma asked. Hearing the girl’s story, she said, “Don’t worry. I think I can help you. How about singing a song together? Happy birthday to …”What a beautiful song! They sang and sang. Suddenly she woke up. It was a dream! She decided to write it down at once and sing it to her friends at the party.
When she sang the song at the party the next day, her friends were very happy. “How wonderfully you sing! We haven’t heard such a beautiful song before. Thank you for giving me the special gift.” said her friend. And they learnt to sing it together. Later the girl became well-known in America.
【小题1】The song Happy Birthday was written by .
| A．an American girl |
| B．an American girl’s grandma |
| C．an American boy |
| D．an American girl’s friend |
| A．she didn’t want to go to the party. |
| B．she would be busy that day. |
| C．she didn’t have enough money to buy a gift. |
| D．she wasn’t invited to the party. |
| A．A flower. | B．A toy. | C．An interesting book. | D．A song. |
| A．boring | B．beautiful | C．exciting | D．interesting |
| A．The girl was still poor after writing the song . |
| B．The girl sang the song with her grandpa in her dream. |
| C．The girl’s friends had heard the song before. |
| D．The girl became famous because of the song. |