题目列表(包括答案和解析)
A new study says one part of the human brain may become smaller as the result of a condition known as jet lag. Jet lag results from flying long distances in an airplane. People with jet lag may feel extremely tired for several days. They may also have problems thinking clearly and remembering.
Recently a researcher at the University of Bristol in Britain reported the findings of his jet lag study, which involved twenty young women who worked for international airlines. They had served passengers on airplanes for five years. These flight attendants flew across many countries and at least seven time zones. In the study, the flight attendants had different amounts of time to recover from jet lag. Half the women spent five days or fewer in their home areas between long flights The other half spent more than fourteen days in their home areas.
The researcher took some saliva from the women's mouths to measure levels of a hormone(荷尔蒙) that increases during stress (紧张). He tested them to see if they could remember where black spots appeared on a computer screen. And he took pictures of their brains to measure the size of the brain's temporal lobes (脑叶).
It was found that the women who had less time between flights had smaller right temporal lobes. This area of the brain deals with recognizing and remembering what is seen. The same group performed worse and had slower reaction times on the visual memory test. And their saliva samples showed higher levels of stress hormones.
The researcher believes the brain needs at least ten days to recover after a long trip. He says airline workers told him their ability to remember got worse after working on planes for about four years. Other studies have shown that increased feelings of stress can cause a loss of cells in the part of the brain that controls memory.
Scientists say more tests are needed to study the effects of jet lag on the brain. They want to find out if too much jet lag could permanently (永久性的) affect memory.
According to the text, jet lag _________.
A. can cause difficulties in speaking
B. can make people feel tired for a few weeks
C. can be only found in flight attendants
D. can be caused by flying over several time zones
It can be inferred from the text that _________.
A. the conclusion is refused by many scientists
B. scientists fear that this research is not done properly
C. every scientific conclusion needs the support from many tests
D. the women who were examined in the research were not healthy
From the result of the research we can see that _________.
A. the women who have longer rest at home show better memory
B. the women who fly in short time have smaller right temporal lobes
C. the women who have longer flights fail the memory test
D. the women who rest more than 14 days produce less hormones
What is the subject discussed in the text?
A. The cause of jet lag. B. A story of a group of flight attendants.
C. The importance of having enough rest after flights.
D. A research about the effects of jet lag on the brain.
Over the past 20 years, AIDS and war have claimed the parents of 2．4 million Ugandan children．When Alexis Hefley first visited the country,, in 1993, she saw the children's sorrow, but the former Texas banker also spotted "a world of possibility"．She watched as they danced for tourists to earn money, and she had a thought: If people in America could see them perform, they'd support them too．
The children's passion and talent inspired Hefley to work with the kids at an orphanage（孤儿院）in Kampala, the capital city of Uganda, to organize a traveling dance troupe（团）．The goals: to give the problems in Uganda a human face, to raise awareness and to raise money．
The first tour touched down at six American cities in 1994．Today, the 22-member troupe, known as the Spirit of Uganda, travels across America every two years．The young performers bring their energy and joy to audiences across the U．S．and help support hundreds of Ugandan orphans back home．Among the young dancers, some earn scholarships to attend the U．S．colleges, and then return to their country to help rebuild it．
Photojournalist Douglas Menuez first photographed the troupe in 2006 -?a project that led to his new book, Transcendent Spirit, from which these images are drawn．At each performance, the dancers' faces show pure joy, quite an achievement given the hardships they've faced．"They look to the future, not the past," explains Menuez．"They embrace beauty and good in the world．" As one dancer puts it, "People think we have lost our parents．We've had so many problems．But then they see us perform．They see our smiles．And they learn that life goes on．"
What are the first two paragraphs mainly about?
A．How miserable Ugandan orphans' life is．
B．How the dance troupe was set up．
C．How the young dancers earned money．
D．How the orphans lost their parents．|
What do we learn about the Spirit of Uganda?
A．It was started by a journalist．
B．It travels across the U．S．annually．
C．It consists of two dozen performers．
D．Its dancers have chances to study in the U．S．
In the eyes of Menuez, the young performers are_____．
A．beautiful B．talented C．optimistic D．humorous
What might be the most suitable title for the passage?
A．Ugandan orphans turn tragedy into dance
B．Transcendent Spirit: A close look at Uganda
C．AIDS and war are claiming people's lives
D．Lots of people are helping Ugandan orphans
Over a hundred years ago people in London were surprised to see a very unusual boat come sailing up the Thames River.The boat was eighty feet long flat-bottomed,with big wooden eyes on both sides in the front and was colorfully painted at the back.
People came to know that it was a sailing boat from Fuzhou in distant China.The boat had sailed round the Cape of Good Hope(好望角) up the western coast of Africa,and finally to England.It had covered fifteen thousand miles—more than half of the distance round the world.
Although it was unexpected,the Chinese were warmly welcomed.The boat carried goods such as silk and tea as well as a number of gifts from the Emperor of China for the Queen of England.
People had always mistakenly thought of the Chinese as a people not used to sea.However,from centuries of trading and sailing in dangerous seas,the Chinese had learned how to build good boats and sailed them well.The coming of this sailing boat to London proved once again that the Chinese could sail to distant countries in the world.
The boat was considered unusual because _________.
A.it was a small wooden boat
B.it carried Chinese silk and tea
C.it had traveled fifteen thousand miles
D.it looked strange in several ways
According to this article,which of the following is TRUE?
A.The distance round the earth measures less than thirty thousand miles.
B.The Chinese Emperor gave silk and tea to the English Queen as gifts.
C.The Chinese boat came to London by accident.
D.The Chinese people were not good at sailing in dangerous seas.
The boat reached London by sailing _________.
A.round the southern end of Africa
B.up the west coast of England
C.through the Arctic Ocean
D.round Asia and Europe
.The writer wants to prove that a long time ago the Chinese _________.
A.carried silk,tea and other goods to England
B.could reach many parts of the world by sea
C.could sail along the Thames River
D.surprised Londoners with an unusual boat
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
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