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[单项选择]Ever wonder why some people can sleep through just about anything, while others get startled awake at each and every bump in the night A new report in the August 10th issue of Current Biology, offers some insight: Sound sleepers show a distinct pattern of spontaneous brain rhythms. "We found that by measuring brain waves during sleep, we could learn a lot about how well a person’s brain can block the negative effects of sounds; the more sleep spindles your brain produces, the more likely you’ll stay asleep, even when confronted with noise," said Jeffrey Ellenbogen of Harvard Medical School.
During sleep, brain waves become slow and organized, Ellenbogen explained. Sleep spindles refer to brief bursts of faster-frequency waves. Those bursts of activity are generated by a portion of the brain called the thalamus (丘脑), which serves as a way station for most types of sensory information (everything except smell).
"The thalamus is likely preventing sensory information fro
A. Brain waves become slow and organized when we sleep.
B. We can measure brain waves during sleep.
C. A person’s brain can block the negative effects of sounds.
D. Sound sleepers show a distinct pattern of spontaneous brain rhythms.
[填空题]Many people wonder why some men want to live on the moon. It is (1) not the kind of place where most men would choose to live. But man has always moved to new areas.
Some scientists hope that continued work will be done on the moon. Many experiments will be done there more (2) . Some large (3) are very easy to do in a place without air. Matter can be heated to very high temperatures without (4) change when it is in such a place. Air, dust, and clouds cannot (5) man’s view of space from the moon. The very high or very low temperatures and low gravity on the moon will be used for many experiments. One very important use of the moon will be to (6) spaceship.
Man might be able to learn much about his own body by living on the moon. He would be living in a habitat that he made for himself. Man would be in control of the (7) of life in which he lives. (8) could be removed from the air in this
[单项选择]
Why do people read the newspaper Some people read it for entertainment; they enjoy sections like the comics or sports. Others look for things to buy or sell; they might look mostly at the advertisements. Most people, though, read the newspapers for news!
The news is reported in news stories, which can be found throughout the newspaper. Unlike the comics or the advertisements, news stories report facts. In this article, you will learn some hints about how to get the most ont of a new story.
Many news stories have the following elements: headline, by-line, dateline, and the lead. The headline, which is above the story, tells what the story is about. The size of the headline depends on the importance of the news — important news would get a large, bold-typed (粗体打印 ) headline. The by-line tells who wrote the story. Not all news stories have by-lines. The date- line, which some news stories don’t have, usually names the place where the story came from or wh
A. news
B. comics
C. advertisements
D. sports
[单项选择]
F
Have you ever seen people dance Some dances are fast and others are slow. People’s feet move when they dance. They keep on moving until the music stops.
People have enjoyed dancing for a very long time. This story is about a different kind of dance. It is a dance without people or music. Yet this dance is one of the oldest in the world. It is the dance of bees.
If you have ever watched bees, you know that they are very clever. They also work hard looking for food and bringing it back to their home. The home of bees is called a bee-hive. Here they make the honey. Where does the honey come from
Bees live on food from flowers. When a bee rests on a flower, it tries to go to its center. There it takes in as much food as its body can hold. Then it carries the food back to the hive. At the hive, bees change the food from flowers into honey. Then they fly away for more food like that.
How does the bee tell others to find
A. Right.
B. Wrong.
C. Doesn’t Say
