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 re
lated to the dopamine levels．However, the researchers found that higher levels of dopamine don’t remove the trouble that people have thinking and learning while sleep-deprived （缺乏睡眠的）．
55．The underlined phrase “conking out” in the second paragraph probably means ．
A．staying awake B．falling asleep C．paying attention D．falling over
56．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
57．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 less quickly one reacts
58．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
Dear Michelle,
My mother is not a good example for me and my sister. She smokes, stays out late, and she curses. I love her but I am ashamed of her. I do not want to bring home my friends because she does not act like any of the other mothers. She says I am a loser because I sit at home and I study. I wish I could live in another family that is normal, but that will not be for another 5 years when I am 18 and legal. What am I supposed to do until then?
Prisoner of a Crazy House
Dear 7th Grade,
I am glad that you love your mother because the rest of your feelings about her may change as you mature and get older.
While it is true that your mother’s smoking, partying and cursing bring you shame, the fact that you want to stay separate from her doing is notable and very smart. It shows that you are a winner, not a loser.
I am guessing, therefore, that you do not bring shame to yourself, and that is a good thing. So, keep it that way and keep away from your mother’s habits.
In the meantime, get the best grades as possible and join clubs and after-school activities. Offer social service on weekends and visit with your friends at their homes.
Unfortunately, you are not alone. Many teens live in homes with immature, misguided, selfish parents. Those kids often feel lonely and separate from the rest of their friends because of their parents’ terrible deeds.
Yet, despite this, some of these very teens grow up to be just fine. They develop good friendships with nice kids, do well in school, and often find a teacher of guidance advisor who makes all the difference!
Do it, Miss Winning 13-year-old, and keep looking forward to your own fine future. Maybe by then your mother may even see the light and realize how surprising you really are.
Best luck!
MichelleThe kids asks for advice on how to _________.
| A．make her mother change | B．grow up in her present situation |
| C．get along well with her mother | D．start a new family with her sister |
Michelle doesn’t call her letter receiver a “Prisoner of a Crazy House” possibly because she ________.
| A．tries to be polite | B．doesn’t write to that kid alone |
| C．knows that’s a girl in Grade 7 | D．wants to cheer up the kid |
Michelle advises the girl to ___________.
| A．try talking to her mother | B．get used to the habits of her mother |
| C．stick to her attitude towards her mother | D．improve her relationship with her mother |
What does Michelle express by the paragraphs beginning with “Unfortunately” and “Yet”?
| A．Many parents act terribly | B．You’re not speaking for yourself |
| C．Parents’ manners make little difference | D．Don’t worry too much about your problem |
Getting ready for a big test? Want to get some extra energy for your next sports event? Or do you just need to relax? Match the mood you’re in( or the mood you’d like to be in) to the descriptions below and find out what color may help.
Feeling tired: Red can help you meet the demands of a busy day. If you’ve got a tough day ahead, try wearing a red sweater or painting your fingernails a rich red to boost(增加) your energy.
Feeling tense or depressed: Green may give you a sense of peace. Take a long walk through a tree-filled park or read a book in a grassy area.
Wanting to use your creativity: Violet(紫罗兰色) helps increase creativity. Think of a creative project you’d like to start and use the color violet as your main theme.
Experiencing lack of interest: Yellow helps to improve thought process and mental sharpness. Start keeping a diary on yellow notepaper, and get some sunlight on your face.
Needing to boost your imagination: Indigo(靛蓝色) strengthens dream activity. Put on your favorite pair of jeans and a pair of indigo sunglasses.
Feeling sad, self-conscious, nervous: Orange may help start your emotions and make you more social. Buy yourself an orange book bag or purse and carry it with you on the days when you’re feeling low.
Having trouble sleeping: Blue helps calm your nerves and brings relaxation. Buy some blue sheets for your bed and curl up with your favorite magazines for a relaxing night. If you’re trying to calm yourself down, you may ________.
| A．wear a red sweater | B．walk through green fields. |
| C．put on a pair of jeans | D．buy a yellow bag |
Which of the following is most helpful in producing unique artwork?
| A．Red | B．Green | C．Violet | D．Orange |
According to the passage, orange____________.
| A．helps fire one’s imagination | B．helps you deal with people easily |
| C．helps have a good rest | D．helps save energy |
If you want to be in high spirits, which colors may help?
| A．Red and yellow | B．Yellow and blue |
| C．Green and violet | D．Blue and green |
Greece is one of the most beautiful countries of the world．Millions of tourist visit this place every year．In Greece the bus is the most convenient and preferred means of traveling．There are intercity buses operated by KTEL that interconnect various cities of Greece,!! and there are international buses operated by OSE that connect Greece to other European cities.
Every tourist must visit Greece at least once in life．This country is really a vacation heaven．It is the perfect blend（融合） of history and art with adventure and romance．You car| dive into deep[
blue waters, climb up the mountains or enjoy ancient architecture and history．
Buses in Greece are cheap and very comfortable．All bus stations display schedules of buses on every route．Conductors and drivers are very polite and helpful．Travelers never face any rouble locating and boarding buses to their destinations．Tourists can always ask the conductor to inform them about their stop, so that they can get down at the right stop．Everyone here is more than happy to help tourists．
Athens, me capital of Greece, has three bus terminals(终点站）．Buses to different parts of Greece leave from different terminals．Air-conditioned express buses also operate between major cities．They are faster and more comfortable than other buses．Tourists can choose guided Greece bus ^our．These tours are the perfect way of exploring this great country． |
Buses in Greece are also a great way of saving bucks on the journey．The long-distance bus system is very cheap．Buses save a lot of money to cover long distances, cheaper than taxis or cars． They are also the best means of interacting with local people．You can sit next to a native of Greece and get some information about the place．The company KTEL offers bus services _____．
| A．to different cities in Greece | B．from Greece to other countries |
| C．to tourist attractions in Greece | D．from Greece to its bordering countries |
It can be inferred from Para．3 that the Greeks are _____．
| A．generous | B．hard-working |
| C．economical | D．warm-hearted |
If you are a tourist to Greece from overseas, you’d better choose _____．
| A．taxis | B．cars |
| C．guided Greece bus tours | D．air-conditioned express buses ; |
The underlined word "bucks" in the last paragraph probably refers to _____． ;
A．money B, energy C．time D．troubleWhile taking long-distance buses, you can _____．
| A．know more about the bus schedules |
| B．make friends with the conductors |
| C．learn more about bus systems in Greece |
| D．learn something about the place you’re visiting |
A Concussion（脑震荡） happens when the brain is shaken, often in a car crash or a fall or a strike on; the head in sports．Concussions can be mild, but doctors may order a CT scan to look for a more serious injury．But a recent study warned that more children than necessary are being exposed（使遭受） to radiation this way．
A national team led by two doctors at the University of California, Davis, studied hospital records from thousands of children with head injuries. They found that in many cases, the risk of developing cancer from the radiation outweighed the risk of a serious brain injury.
The study found that one in five children over age two had a low risk of serious injury but received CT scans anyway. The same was true of almost one in four children under two years of age.
The researchers have developed rules to predict if a head injury is serious enough for a scan. For children under two, doctors are advised against it if there is:
·Normal mental activity.
·No swelling in the back of the head.
·No feeling of a broken bone in the skull. (头骨)
·And no loss of consciousness for more than five seconds.
Doctors should also consider how the child was injured and whether the parents say the child is acting normally.
For patients from two to eighteen, the guidelines are similar —— except there should be no l vomiting（呕吐）and no severe headache.
Earlier this year, the British Journal of Sports Medicine published new guidelines for concussions in children and teens. International experts said they should not return to sports or school until fully recovered. The brain also needs a "cognitive rest," they say, by restricting activities like video games, texting and watching TV.
It often take longer than adults to recover from a concussion than adults. The experts say individual progress and not a set time period should always guide a decision to return to play. The researchers at the -University of California found that children who received CT scans
| A．were likely to suffer brain injuries |
| B．wouldn’t have normal mental activity |
| C．would lose consciousness now and then |
| D．were likely to develop canter |
How many aspects should doctors consider when deciding whether a child under two needs a CT scan?
| A．Four． | B．Six． | C．Seven． | D．Nine． |
What can we learn from the last two paragraphs?
| A．Texting is harmful to patients’ recovery from concussions． |
| B．Patients with brain injuries can play many sports． |
| C．Adults need a longer time than teens to recover from concussions． |
| D．It takes at least a year for individuals with brain injuries to fully recover． |
The author of the passage mainly___．
| A．describes the risks of brain injuries |
| B．suggests CT scans are of practical use |
| C．tells us about the risks of brain injury tests |
| D．argues against new guidelines for concussions |
Our planet is in trouble．Polluting industries and corporations are destroying our planet, resulting in increasing global temperatures, melting ice caps, and economic turmoil（混乱）．All across the country, folks are waking up to the reality that if they do not ad now to solve the environmental problems of today, the consequences are unthinkable．If we don’t i ct now, who will? Fortunately, an amazing team of young leaders are taking action．They a e getting involved with the Greenpeace Student Network!
The Student Network has student leaders who deal with the most pressing environmental issues．We have organized and won inspiring campaigns．Convincing corporations to change their ways and politicians to do the right thing．All thanks to our team of leaders, known as Campus Coordinators．
Campus Coordinators are located all across the United States, and even Canada! They work on Greenpeace Student Network campaigns at their schools and in their communities．They organize events like film screenings and days of action．They hold meetings with elected officials, work with the media, recruit（招募） volunteers, and mobilize（动员） their campus to take action! They do all of this with excellent training and expert support from our team of Student: Network staff．Campus Coordinators develop their leadership skins and become an unstoppable force for green solutions on pus and in their community．
Currently, the Greenpeace Student Network is campaigning to solve the largest environmental threat to humankind: global warming．With only months until a new international treaty（协议）on global warming is decided this December, the time to stand up and take the lead has never been
more important,
If you are concerned with environmental issues, want to mobilize your scho4l and community, nd are ready to become a skilled organizer and strong leader, then the Campus Coordinator position is for you! We are now accepting applications for the Fall 2009-Spring 2010 academic year．
Are you ready to be a leader on your campus?
Apply to be a Campus Coordinator today!Why does the author write the passage?
| A．To describe the serious environmental problems． |
| B．To call on students to apply to be Campus Coordinators, |
| C．To explain the advantage of the Greenpeace Student Network．． |
| D．To stress the importance of solving environmental problems． |
We can learn from the passage that the Greenpeace Student Network _____．
| A．is a place where school leaders are framed |
| B．is a worldwide organization helping student leaders |
| C．helps solve corporations’ economic problems |
| D．helps deal with global warming at present |
If you are a Campus Coordinator, you may probably _____．
| A．have．the chance to play a role in a film |
| B．find a job at a TV station |
| C．develop your leadership skills |
| D．build up your strength． |
Which of the following is NOT mentioned in the passage?
| A．The duty of Campus Coordinators． |
| B．The distribution of Campus Coordinators． |
| C．The aim of the Greenpeace Student Network． |
| D．The history of the Greenpeace Student Network． |