How would you like to sleep with one half your brain asleep and the other half awake? Dolphins sleep this way. Recently, scientists at Indiana State University have discovered that ducks sleep this way too. They found that ducks sleep half awake so they can rest and watch for danger at the same time.
After putting their ducks in a row and videotaping them, some researchers found ducks on the end of each row spent more time asleep with one eye open, apparently looking for predators.
“The more the ducks felt threatened, the more they slept with one eye open,” said lead author Niels C. Rattenborg, a graduate student at Indiana State University, Terre Haute. “The unique aspect is not that they do it, but that they control it. When they sleep at the edge of a group, they tend to realize greater danger, so they spend more time sleeping with one half of their brain.” Ducks with one eye open were still awake enough to detect predators, said the authors of the study, which appears today in the journal Nature.
The researchers studied four groups of four ducks held in plastic boxes, which were arranged in a row. Ducks on the end were found to sleep with one eye open 31.8 per cent of the time, compared to 12.4 percent of the time for ducks in the central position.
Also, ducks in the central position did not open one eye more than the others, while ducks on each end kept the eye facing away from the group open 86.2 per cent of the time. Brain wave readings of the ducks showed that the half of the brain receiving signals from the closed eye indicated that half of the brain was sleeping. Signals from the half of the brain receiving signals from the open eye showed a state between fully awake and asleep.The under lined word “predator” is most likely to mean .
| A．an animal that is likely to be friends with ducks |
| B．a human being who looks after and feeds ducks |
| C．a scientist who does research work on animals |
| D．an animal that hunts, kills and eats other animals |
Ducks at the end of each row sleep with one eye open because .
| A．they are looking for food |
| B．they are watching out for danger |
| C．they want to enjoy the scenery |
| D．they are unique in their sleeping habit |
Which of the following is true according to the passage?
| A．Ducks with one eye open at the edge can still enjoy a certain degree of sleep. |
| B．Ducks with less sense of duty usually choose to stay in the center of a row. |
| C．Ducks on the northern end of a row would keep their eye facing the south open. |
| D．A video tape recorder was the only electronic device used in the experiment. |
I had recently arrived in London and I wanted to see some of the famous places. Should I go to the seaside? Or maybe one of the famous parks? I walked along the street, past a kindergarten playground, and suddenly saw an underground railway station. I was surprised because it was not on my map. I went to buy a ticket. The ticket-seller looked very old. He gave me a ticket, said "Remember it's a return", laughed and walked away without taking my money. Was it special for tourists?
A train arrived. I could not see any other passengers. I got on and the doors closed. I suddenly felt I should not have got onto the train. It started to go faster and faster, shooting along the tracks. As it entered the tunnel, everything became as dark as midnight and I do not remember the next few minutes. The train came to a station and I got out. I could see light shining in the distance so I walked towards it and came to a door. Beyond it there was a busy street.
There were lots of English people walking about, and I could see some of the famous buildings of London, but there was something wrong. The people's clothes were strange. There were no cars, no motorbikes—but there were horses everywhere. Was someone making a film?
“Excuse me,” I said to a man. “Would you mind telling me where I am and what is happening?”
“What do you mean? Who are you? Where do you come from? Are you from China? This is London and everyone's going to work. Can't you see that?” he asked.
“Thank you, sir. I'm sorry, but could I look at your newspaper?” I asked.
“You can have it,” he said as he walked off.
I looked at it; I saw “New Bicycle Law” and above that “July 5, 1880”.
Maybe I should have walked around, but I ran back to the door. I waited a long time. I was very afraid. A train came. I got on. It took me back to the first station. As I left, a woman asked, “What were you doing in that abandoned station?” I had no answer, but I still had the newspaper in my hand.Why was the author surprised at the beginning of the story?
| A．Because he suddenly saw an underground railway station. |
| B．Because he walked past a kindergarten playground. |
| C．Because the ticket-seller looked very old. |
| D．Because he couldn’t find the station on his map. |
What does the underlined “it” in the second paragraph most probably mean?
| A．The train. | B．The light. |
| C．The distance. | D．The door |
Why did the author think he had arrived in a film-making scene?
| A．Because he could see some of the famous buildings of London. |
| B．Because he had done something wrong in the street of London. |
| C．Because he could only see horses rather than cars in the streets. |
| D．Because the people in the streets were all neatly dressed. |
According to the passage, New Bicycle Law might be _______.
| A．The name for a London street. |
| B．The name for a film made in London. |
| C．The name for a newspaper article |
| D．The name for a underground station. |
Where can this passage most probably be taken from?
| A．In a storybook. |
| B．In a math textbook. |
| C．In a travel guidebook. |
| D．In a scientific experiment report. |
People like different kinds of vacations. Some go camping. They swim, fish, cook over a fire and sleep outside. Others like to stay at a hotel in an exciting city. They go shopping all day and go dancing all night. Or maybe they go sightseeing to places such as Disneyland, the Tai Mahal or the Louvre.
Some people are bored with sightseeing trips. They don’t want to be “tourists”. They want to have an adventure— a surprising and exciting trip. They want to learn something and maybe help people too. How can they do this? Some travel companies and environmental groups are planning special adventures. Sometimes these trips are difficult and full of the world. Some volunteers spend two weeks and study the environment. Others work with animals. Others learn about people of the past.
Would you like an adventure in the Far North? A team of volunteers is leaving from Murmansk, Russia. The leader of this trip is a professor from Alaska. He’s worried about chemicals from factories. He and the volunteers will study this pollution in the environment. If you like exercise and cold weather, this is a good trip for you. Volunteers need ski sixteen kilometers every day. -
Do you enjoy ocean animals? You can spend two to four weeks in Hawaii. There, you can teach language to dolphins. Dolphins can follow orders such as “Bring me the large ball”. They also understand opposites. How much more can they understand? It will be exciting to learn about these intelligent animals. Another study trip goes to Washington State and follows orcas. We call orcas “Killer Whale”, but they’ re really dolphins—the largest kind of dolphin.. These beautiful animals travel together in family groups. They move through the ocean with their mothers, grandmothers and great-grandmothers. Ocean pollution is chasing their lives. Earthwatch is studying how this happens.
Are you interested in history? Then Greece is the place for your adventure. Thirty-five hundred years ago a volcano exploded there, on Santorini. This explosion was more terrible than Krakatoa or Mount Saint Helens. But today we know a lot about the way of life of the people from that time. There are houses, kitchens, and paintings as interesting as those in Pompei. Today teams of volunteers are learning more about people from the past.
Do you want a very different vacation? Do you want to travel far, work hard and learn a lot? Then an Earthwatch vacation is for you.The Tai Mabal may be _________.
| A．a shopping center | B．a hotel |
| C．a dancing ball | D．a place of interest |
From the passage, on an adventure trip, people ______________.
| A．may not spend much time on sightseeing |
| B．won’ t meet some difficulties or hardships |
| C．can’t enjoy themselves |
| D．can’t learn something |
If you want to learn something about people of the past, you can ___________
| A．join the team to Hawaii |
| B．join the team to the Far North |
| C．join the team to Washington |
| D．join the team to Greece |
The word “intelligent” in paragraph 4 means __________________.
| A．exciting | B．beautiful | C．large | D．clever |
Which of the following is false ?
| A．Some people find sightseeing trips boring. |
| B．Earth watch is planning all these special adventures |
| C．The number orcas is decreasing. |
| D．3 volcano explosions in all broke out 3, 500 years ago in Greece. |
The Washington post – NASA’s newest space habitat looks sort of like a kids’ moon bonce, a big, bright, inflatable globe that could be lots of fun to play in. Soon astronauts on the International Space Station could get the chance to try . The expandable habitat made by Bigelow Aerospace recently passed NASA’s strict certification requirements and is scheduled to be flown to the station in September.
Called the BEAM ( Bigelow Expandable Activity Module), the habitat would be attached to the space station, where it would stay for two years. While there, it would be tested to see how it handles the rigors of space – the radiation, the station’s movement and even how it stands up to the debris (碎片) flying around in orbit.
The private Las Vegas company, founded by millionaire real estate mogul(地产大亨) Robert Bigelow, won a $17.8 million contract from NASA to provide the module to the space station.
“Today is the first step, but it’s a big step,” said Bigelow’s George Zamka. Replace the space station or make it larger. It also hopes to build the habitats on the moon. Its B330 module would be even bigger, with 330 cubic meters of internal (内部的 ) space. The modules could be connected. Creating research facilities, the company says, or even space hotels.
In an interview ,NASA’s William Gerstenmaier, said he was eager to see how the module performs , and said he was especially pleased “ to see how the private sector can step up and help us meet our requirements.” The module will be flown to the space station by SpaceX, the first commercial company to resupply the space station.What would be the best title for this passage?
| A．NASA’s space habitats flown to the station. |
| B．NASA’s space habitat it the station. |
| C．NASA’s new expandable space habitat. |
| D．NASA’s newest inflatable globe. |
Which of the following is TRUE according to the passage?
| A．NASA’s newest space habitat is a kids’ moon bounce. |
| B．Astronauts of Bigelow Aerospace could get the chance to try the space habitat. |
| C．NASA was founded by Robert Bigelow. |
| D．The B330 module to be built on the moon would be with an inside space of 330 cubic meters. |
The underlined word “rigors” in Paragraph 2 refers to “_________”.
| A．difficulties | B．environments |
| C．movements | D．changes |
The passage is most probably taken from ________.
| A．a newspaper | B．a booklet |
| C．a magazine | D．a science fiction |
The food we eat seems to have a great effect on our health. Although science has made big steps in making food more fit to eat, it has, at the same time, made many foods unfit to eat. Some research has shown that perhaps eighty percent of human illness is related to food and forty percent of cancer is related to food as well. That food is related to illness is not a new discovery. In 1945, some researchers realized that things commonly used to keep colors in meats and other food additives (添加剂) caused cancer.
Yet, these additives remain in our food, and it is difficult to know which things on the wrappings（包装）of foods are helpful or harmful. The additives which we eat are not all so direct. Farmers often give penicillin (青霉素) to their animals, and because of this, penicillin has been found in the milk of cows. Sometimes similar things are supplied to animals not for their health, but just to make a profit.
The farmers are simply trying to fatten the animals in order to get a higher price on the market. Although some countries have tried to control such things, the practice continues.According to this passage, we can know _____.
| A．perhaps most kinds of cancer are related to what people eat |
| B．perhaps most of human illness is caused by what we eat |
| C．cancer was discovered in 1945 |
| D．science has made food unfit to eat |
Things that are used to keep colors in meats are _____.
| A．harmful | B．useless | C．helpless | D．dangerous |
People use additives _____.
| A．to make food more unfit to eat |
| B．to cause cancer |
| C．to change the color of the food |
| D．to take off the diseases of the food |
Which of the following is NOT true?
| A．Some wrappings of food are harmful. |
| B．Farmers try to make more money on the market by fattening their animals. |
| C．"The practice continues" means "things are still going on like that". |
| D．We needn't take care of what we eat. |
Du Kun，a Chinese boy is called“the youngest writer in the world．”He has written three books till now．Du Kun was born in Jiangsu in 1994．When he was 7 months old．his parents started working in over 30 different cities，such as xi’an and Shenzhen．This kind of life gave him things to think and write about．When he was 9 months old，he could speak and at the age of one，he could say five to six hundred words．At three，he could look up words in the dictionary．At four，his father taught him how to learn by himself．His parents like reading very much．So does he．At the age of 5，he began writing fairy tales．At the age of 6．he wrote a novel about his life in different cities with his parents．His fairy tales are all from his life．One day，he found many mice in the house．They not only ate their food but also hurt his mother’s hand．So he thought，“If we give mice the stomach of cows，they will eat grass and they will be helpful to people．”This was his first fairy tales Change Stomach for Mice．Now he studies well in a middle school．
He has written his third book．The novel called Eyes of Children．He says，“I am not different from other children，I just wrote several books．”Thanks to his________，Du Kun could write his books．
| A．mother | B．father |
| C．school life | D．life in different cities |
Du Kun began to use a dictionary，________．
| A．when he wrote fairy tales |
| B．before his father taught him how to learn something |
| C．after he went to school |
| D．after his mother taught him how to learn something |
The underlined sentence shows us that Du Kun________．
| A．is different from other children |
| B．doesn’t tell the truth |
| C．is the same as other children |
| D．likes his books |
Which is the best title?
| A．Three Books by a Child |
| B．How to Write a Fairy Tales |
| C．How Clever the Boy is |
| D．Du Kun the Youngest Writer |