When the school year starts, it can be difficult to get up early．After a few early mornings, extreme tiredness might make you feel like you’re going to fall over．The amazing thing is that you probably manage to stay awake all day long and into the night．But how?
A chemical in the brain called dopamine（多巴胺）might be part of the answer．According to new research, dopamine is what keeps people who don’t get enough sleep from conking out．The chemical also has a complicated influence on your ability to think and learn when you don’t get enough sleep．
To study sleep loss and its effect on the brain, scientists rounded up 15 healthy volunteers．The scientists tested each person’s memory and ability to pay attention twice: once after a good night’s sleep and once after being kept up all night long．During the tests, the scientists measured levels of dopamine in the brains of the volunteers．
The results showed that when the volunteers stayed up all night, dopamine levels increased in the brain．Higher levels of dopamine kept the volunteers awake even though they felt tired．Some people are amazingly able to think clearly and react quickly, even when they haven’t had much sleep．Other people have a really hard time paying attention when tired, and their reactions are slow．All of these may be related to the dopamine levels．However, the researchers found that higher levels of dopamine don’t remove the trouble people have thinking and learning while sleep-deprived （缺乏睡眠的）．
60．The underlined phrase “conking out” in the second paragraph probably means ．
A．staying awake B．falling asleep
C．paying attention D．falling over
61．With a higher level of dopamine, one ．
A．will not dream dreams at night B．may have trouble in falling asleep
C．can still stay awake after staying up D．can do better in learning and working
62．We can infer from the last paragraph that ．
A．not all people can react quickly after they stay up late
B．dopamine in our brain does not work when we are sleeping
C．lack of sleep has no influence on one’s learning and thinking ability
D．the higher the dopamine levels are, the more quickly one reacts
63．The passage is developed by ．
A．setting up a point and discussing it
B．giving examples and drawing a conclusion
C．pointing out similarities and differences
D．showing a fact and explaining the cause
At least 10 million hectares of cultivated（耕作）land in China are polluted, which makes a grave threat to the country’s food safety, the Xinhua News Agency reported on Friday.
The polluted land，which is mostly in economically developed areas，accounts for one-tenth of the country’s total arable（可耕种的）land，according to an incomplete survey by the State Environmental Protection Administration，China’s top environment watchdog.
Pollution on cultivated land threatens the environment，food safety and the sustainable development of agriculture，the administration said.
Because of continual，too much use of chemical fertilizer, pesticide and agricultural plastic sheeting, as well as irrigation using polluted water, a large amount of contaminants（污染物）remain in the cultivated land.
The contaminants affect the soil’s ecological structure and function，leading to decreased soil productivity, lower crop yield（产量），and lower quality of agricultural products-
It also leads to worse water quality in rural areas.
Less than 9 per cent of drinkable water passed checks for bacteria in243 rural water supply stations across the county.
Another survey, which took samples of drinking water and groundwater an 69 small towns。 in Beijing, Tianjin and Hebei Province of North，China, showed that more than half of the water contains too much nitrate（硝酸盐），which may cause diabetes（糖尿病）and damage the kidney.
The administration estimated at least 1 90 million farmers are drinking water that contains harmful substances.
Many villagers drink unfiltered water taken from shallow water wells or water cellars， which are reported to have poor sanitary conditions·The author writes the passage to.
| A．1et the readers examine their mistakes |
| B．present the readers a new idea |
| C．come up with a solution to ending farmland pollution |
| D．inform the readers of the importance of fighting farmland pollution |
The underlined word “grave” in Paragraph 1 probably means
| A．serious | B．certain | C．big | D．terrible |
Pollution on cultivated land leads to the following outcomes EXCEPT.
| A．a threat to China’s food safety |
| B．worse water quality in rural areas |
| C．a variety of diseases |
| D．the sustainable development of agriculture |
As computers become all the more popular in China, Chinese people are increasingly relying on computer keyboards to input Chinese characters. But if they use the computer too much, they may end up forgetting the exact strokes of each Chinese character when writing on paper. Experts suggest people, especially students, write by hand more.
Do you write by hand more or type more? In Beijing, students start using a computer as early as primary school. And computer dependence is more widespread among university students. Almost all their assignments and essays are typed on a computer.
All the students interviewed say they usually use a computer.
It’s faster and easier to correct if using a computer. And that’s why computers are being applied more and more often to modern education. But when people are taking stock in computers increasingly, problems appear.
“When I’m writing with a pen, I find I often can’t remember how to write a character, though I feel I’m familiar with it.”
“I’m not in the mood to write when faced with a pen and paper.”
Many students don’t feel this is something to worry about. Now that it’s more convenient and efficient to write on a computer, why bother to handwrite?
Many educators think differently. Shi Liwei, the headmaster of a famous primary school in the capital said, “Chinese characters enjoy both practical and aesthetic (审美的) value. But those characters typed with computer keyboards only maintain their practical value. All the artistic beauty of the characters is lost. And handwriting contains the writer’s emotion. Through one’s handwriting, people can get to know one’s thinking and personality. Beautiful writing will give people a better first impression of them.”
To encourage students to handwrite more, many primary schools in Beijing have made writing classes compulsory(必修的) and in universities, some professors are asking students to turn in their homework and essays written by hand. Which of the following can best serve as the title of the passage?
| A．The Importance of Handwriting and Typing. |
| B．To type or to Handwrite. |
| C．Writing by Computer will Replace Writing by Hand. |
| D．Practical and Aesthetic Value of Chinese Characters. |
Which of the following statements is NOT the advantage of handwriting?
| A．Handwriting contains the writer’s emotion. |
| B．The writer’s thinking and personality are shown in his or her handwriting. |
| C．Handwriting can impress people well and build one’s self-confidence. |
| D．Chinese characters enjoy both practical and aesthetic value. |
The underlined expression “taking stock in” probably means ___________.
| A．getting bored with | B．getting dependent on |
| C．becoming curious about | D．getting curious about |
We can draw the conclusion from the passage that ___________.
| A．more and more students will give up writing on a computer. |
| B．writing by hand will give way to typing by computer one day. |
| C．more and more students will pay attention to handwriting. |
| D．the typing article better expresses one’s emotion and quality. |
As for visiting Walt Disney World. People usually have trouble in arranging. The following will give you some practical suggestions on paying a valuable visit to the famous park.
When to go?
While it’s always busy, Disney World is slightly slower between mid-January and March. It’s summer when the visitors , combined with the heat and humidity(潮湿)， are crowded. Your best choice is either early in the morning or late in the day--- often you can enjoy more rides in the first or last two hours of the day than you can the entire rest of the day combined.
Where to stay?
The question: to stay on Disney World Resort property or not. Disney World offers three resort pricing: Deluxe(豪华的), Moderate, and Value, with good facilities and in-hotel attractions. That said, they all offer “Extra Magic Hours”(early access to the theme parks), guaranteed entry when the parks are over-crowded, and frequent shuttle service to the many attractions. Off-property hotels will have shuttle transfers, but often at less regular intervals(间歇)，wasting more time in transport. You’ll also need a rental car, which adds to the expense, making up for saving in the hotel rate. The “Magic Your Way Package” is a good value if you have a large family.
What to do?
Make use of the “Fast Pass” , which , for no extra cost, allow you to insert your entrance ticket into a particular machine at the attraction and receive a schedule ride time a little later on. For example, use your Fast Pass ticket at a ride just before getting lunch. Once you’re done eating, you can return to the ride and jump right on during the busiest time of day. At the Animal Kingdom, the animals are most active either early or late in the day, so plan accordingly. Thankfully this is fit for the least busy times of day in the park. Study the map of the park the night before to plan your visit. You’ll save time by knowing where things are and where you’re headed. Visitors who use Fast Pass tickets ________
| A．can get discounts on tickets |
| B．will have a well-planned ride time |
| C．will often be checked at the exit |
| D．have to pay more for their tickets |
If you have referred to the map of the park, you ________
| A．are sure to save time |
| B．will get the lowest-priced tickets |
| C．can learn the park’s location |
| D．may have your lost tickets replaced |
The underlined word “this” in the text probably refers to the fact that ________
| A．there are more visitors at that time |
| B．animals are active at that time |
| C．the Animal Kingdom attracts fewer visitors |
| D．Fast Pass benefits visitors a lot |
It can be learned from Part 2 that _________
| A．every visitor will have a rental car for free |
| B．all the shuttle transfers are convenient for visitors. |
| C．three typed of resort pricing are offered by Disney World |
| D．Young couples are advised to take the Magic Your Way Package |
"Get out of the plane!" Justin shouted. Teddy and he dropped to the ground…
When Kathy and Victor reached the edge of the meadow, flames of the fire were shooting more than five meters into the air．
Kathy couldn't believe what she was seeing．One glance told her they needed medical attention immediately．She questioned Victor, "Are you able to find someone nearby for help?"
"There are no farmers, nor villagers nearby," he replied．
"I'm a distance runner, and I'll go for help．" Looking at the seriously injured men, Kathy said to Victor, "It may take me several hours to get out．" She started out．
When she was 23, Kathy set a women's record in a Marathon of 42 kilometers．But now she was running the race of life. She had nearly 30 kilometers of hard wilderness to cover to get help．
Kathy had been running for two hours．This was far back into the wilderness．The country path was growing vague．She stopped to take a quick compass reading．Yes, she had run almost for more than 20 kilometers．Her heart fell, her muscle aching．And finally she saw her car in the distance．
She jumped into the car and sped away．She reached a holiday house and called the police．
During the wait, she walked around, relaxing her legs and drinking water. It took almost two hours for a police helicopter to reach her at the trail end．They needed her for one more task．Who actually had the airplane accident?
| A．Justin and Teddy | B．Kathy and Victor |
| C．Justin himself | D．Kathy herself |
The underlined part "Now, she was running the race of life" means that ____．
| A．Kathy would set up a new record |
| B．Kathy would run a race alone |
| C．Kathy was running for the lives of others |
| D．Kathy couldn't rely on Victor this time |
Kathy stopped to have a look at her compass because ____．
| A．she wasn't sure of her own memory |
| B．she had completely lost her way |
| C．the country path was getting vague |
| D．there was only the wilderness |
What do you think Kathy's final task would be?
| A．Giving the injured food and drinks． | B．Showing the police the crash site． |
| C．Going back to put out the big fire． | D．Taking the injured to the hospital． |
For some kids, old photos and baby pictures are embarrassing. For others, they are cherished keepsakes (纪念品). But for thousands of children living in orphanages (孤儿院) worldwide, these records of the past simply don't exist. Either the kids' parents weren't around to snap photos, or the pictures have been lost. Whatever the reason is, the Memory Project is giving orphans a lasting document of their youth.
Over the last two years, the Memory Project has provided hand-painted portraits to more than 4,000 children living in orphanages in poor countries. Ben Schumaker, 24, got the idea when he was visiting an orphanage in Guatemala in Central America. But he's not creating the portraits(肖像) alone. Students in hundreds of high school art classes across the U.S. paint them using photos sent from the orphanages.
Schumaker believes that the artists benefit from the project as much as the orphans do.“There are two purposes of the Memory Project,” he said. “One is to offer a special gift to the child abroad. The other is to help open the eyes of the student who is painting.”Staring into the eyes of another person, Schumaker believes, it creates a real connection. This connection raises awareness in U.S. schools about the needs of the world's poor children.“It's about planting a seed,” he said.
Schumaker is also working on Books of Hope, a project in which students of all ages put together homemade books for children in Uganda and India. He hopes that one day children in Uganda and India. He hopes that one day children in Uganda and India will send books to the U.S. “It's important to me to have it be a two-way exchange,” Schmnaker says.Old photos and baby pictures are clearly unavailable to __ .
| A．the kids in rich families | B．the kids in common families |
| C．the kids in expanded families | D．the kids without parents |
How can the orphans in Guatemala get a continuing record of their youth?
| A．By hand-painted portraits that Ben Schumaker painted. |
| B．By the photos the orphanage taken for them. |
| C．By the photos taken by the U.S. students in high schools. |
| D．By the Memory Project started by Ben Schumaker. |
What does the third paragraph mainly tell us?
| A．The special gifts that the world's poor children received. |
| B．The benefits that the Memory Project brings. |
| C．The need of the US schools. |
| D．How to help the orphans. |
According to the passage, Schumaker helps the kids in .
| A．two countries | B．three countries |
| C．four countries | D．five countries |