题目列表(包括答案和解析)
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WASHINGTON－According to statistics compiled by the Federal Bureau of Investigation, 72 officers were killed by criminals in 2011, increased markedly in recently years．
The 2011 deaths were the first time that more officers were killed by suspects than car accidents．The number was the highest in nearly two decades, excluding those who died in the Sept．11 attacks in 2001 and the Oklahoma City bombing in 1995．
While the F．B．I．and other law enforcement(执行)officials cannot fully explain the reasons for the rise in officer homicides, they are clear about the terrible consequences．
“In this law enforcement job, when you pin this badge on and go out on calls, when you leave home, you can't guarantee that you will come back,” said Sheriff Ray Foster of Buchanan County, Va．
After a series of killings in early 2011, Attorney General Eric H．Holder Jr．asked federal authorities to work with local police departments to try to come up with solutions to the problem．
The F．B．I．, which has tracked officer deaths since 1937, paid for a study conducted by John Jay College that found that in many cases the officers were trying to arrest or stop a suspect who had previously been arrested for a violent crime．
That prompted the F．B．I．to change what information it will provide to local police departments, the officials said．Starting this year, when police officers stop a car and call its license plate into the F．B．I．'s database, they will be told whether the owner of the vehicle has a violent history．Through the first three months of this year, the number of police fatalities has dropped, though it is unclear why．
Some law enforcement officials believe that techniques pioneered by the New York Police Department over the past two decades and adopted by other departments may have put officers at greater risk by encouraging them to conduct more street stops and to seek out and confront(对抗)suspects who seem likely to be armed．In New York and elsewhere, police officials moved more officers into crime-ridden areas．
Some argue that the rise in violence is linked to the tough economy．With less money, police departments, after years of staffing increases, have been forced to make cutbacks(削减)．
The police chief in Camden, N．J．, J．Scott Thomson, whose force of 400 was cut by nearly half last year because of financing issues, said that having fewer officers on the street “makes it that much more difficult to create an environment in which criminals do not feel as encouraged to attack another person, let alone a law enforcement officer．”
“Every stop can be potentially fatal, so we are trying to make sure the officers are ready and prepared to face deadly force every single day they go out．” Ms．Klimt said．
Directions; Complete the following passage by using the words in the box．Each word can only be used once Note that there is one word more than you need．
A．actually B．suddenly C．impact D．fitness E．memories
F．imaging G．responsible H．implications I．boost J．encouraging
If you want to 1._ your child's results at school, you could do a lot worse than ensuring that they do plenty of exercise．Scientists have already shown that physical activity can make you cleverer．A team in America has used scans to show that an important part of the brain _2._ grows in children who are fit．These youngsters tend to be more intelligent and have better _3._ than those who are inactive．
Scientists also found that one of the most important parts of their brains was 12 per cent larger than those of unfit youngsters．They believe that _4._ children to take exercise from a very young age could help them do better at school later．Researchers from the University of Illinois, in the U．S．, studied the brains of 49 children aged nine and ten using a magnetic resonance _5._ scan, a technique which provides very detailed pictures of organs and tissues in the body．
They also tested the _6._ levels of the children by making them run on a treadmill．The scientists found that the hippocampus（海马体）, a part of the brain _7._ for memory and learning, was around 12 per cent larger in the fitter youngsters．
Professor Art Kramer, who led the study published in the journal Brain Research, said the findings had important _8._ for encouraging individuals to take part in sport from a young age．"We knew that experience and environmental factors and socioeconomic status all _9._ brain development," he said．"If you get some lousy（坏的） genes from your parents, you can't really fix that, and it's not easy to do something about your economic status．But here's something that we can do something about．
The sleep debt is the difference between the amount of sleep you should get and the amount you actually get. It grows every time we skim some extra minutes off our nightly sleep. “People accumulate sleep debts gradually,” says Dr. William Dement, founder of the Stanford University Sleep Clinic. Studies show that such short-term lack of sleep leads to a foggy brain, impaired vision, worsened driving and troubled remembering. Long- term effects include obesity, insulin(胰岛素) resistance, and heart disease.
A 2007 survey by the National Sleep Foundation reports that Americans sleep for 6.9 hours per night, 6.8 hours on average during the week and 7.4 hours on the weekends. Generally, experts recommend eight hours of sleep per night, although some people may require only six hours of sleep while others need ten. That means on average, Americans lose one hour of sleep each night more than two full weeks of sleep every year.
The good news is that the sleep debt can be repaid with some work, though it won’t happen when you sleep longer for once. Adding an extra hour or two hours of sleep a night is the way to catch up. For the long-term sleep shortage, it takes a few months to get back to natural sleeping pattern, says Lawrence J. Epstein, medical director of the Harvard Sleep Health Center.
Go to bed when you are tired, allowing your body to wake you in the morning, with no alarm clock. You may find yourself uncomfortable at the beginning of the recovery cycle. Expect to bank to ten hours shut-eye per night. As the days pass, however, the amount of sleeping time will gradually decrease. For recovery sleep, both the hours of the sleep and the intensity(强度) of the sleep are important. The most refreshing sleep occurs during deep sleep, which is generally considered a restorative (促使健康的) period for the brain. And when you sleep for more hours, you allow your brain to spend more time relaxing.
As you reduce the sleep debt, your body will come to rest at a sleeping pattern that is specifically right for you. Sleep researcher believe that genes determine our individual sleeping patterns. So you can’t train yourself to be a “short sleeper”. A 2005 study in the journal Sleep found that the more tired we get, the less tired we feel.
46. Which of the following is NOT the side effect of sleep debt?
A. Putting on weight. B. Having a bad memory.
C. Having trouble eating food. D. A temporary loss of eyesight.
47. We learn from the 2007 survey that _______.
A. Americans generally don’t have enough sleep
B. Americans sleep too much over the weekends
C. everyone is supposed to sleep for eight hours
D. most people lack two weeks of sleep every year
48. What should we do to make up for the sleep shortage?
A. We should go to sleep when we are free.
B. We should sleep for at least ten hours every day.
C. We should sleep for one or two more hours at night.
D. We should sleep day and night during the holidays.
49. Why is the intensity of the sleep important to us?
A. Our brain is resting when we are sleeping deeply.
B. Deep sleep helps our brain to fully recover.
C. We feel more relaxed when sleeping soundly.
D. Short sleep makes our body more refreshing.
50. The author seems to believe that _________.
A. the more tired we are getting, the more sleep we need
B. the sleeping patterns have nothing to do with our genes
C. it is possible for us to reduce our sleep time by training
D. it is wise for us to adapt to our natural sleeping patterns.
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