单选题He gave me a book of the sort usually {{U}}reserved{{/U}} for naughty schoolchildren.

单选题My father is a physician.A. researcherB. professorC. doctorD. student

单选题Florence Nightingale was born into a rich

单选题NICE uses what it calls "citizens councils" to help it sort through difficult ethical issues, and one of the decisions the councils have made is that age should not be a factor in the institute's approval process--that is to say, a year of life should be considered as valuable to a 77 - year - old as to a 12 -year- old. In every part of the system, a 77 -year--old has the same access to treatment as anyone else in Britain. "Citizens councils" can help NICEA. dealing with difficult ethical issues.B. deciding the age at which people should receive proper health care.C. taking care of the old.D. taking care of the youn

单选题High Stress May Damage Memory According to a report issued in May 1998, elderly people who have consistently high blood levels of cortisol don't score as well on memory tests as their peers with lower levels of the stress hormone. What's more, high levels of cortisol are also associated with shrinking of the hippocampus, a region of the brain that plays a key role in learning and memory. The findings suggest that even cortisol levels in the normal, "healthy "range can actually accelerate brain aging. The study results "now provide substantial evidence that long—term exposure to adrenal stress hormones may promote hippocampal aging in normal elderly humans, "write Nada Porter and Philip Landfield of the University of Kentucky in Lexington in their editorial. Cortisol is a hormone released in response to stress by the adrenal glands, which sit on top of the kidneys. Over a 5 to 6—year period. Dr. Sonia Lupien and his colleagues measured 24—hour cortisol levels in 51 healthy volunteers, most of whom were in their 70s. Despite wide variation in cortisol levels, the participants could be divided into three subgroups: those whose cortisol progressively increased over time and was currently high (increasing/high); those whose cortisol progressively increased over time and was currently moderate (increasing/moderate); and subjects whose cortisol decreased, but was currently moderate (decreasing/moderate). The researchers tested the volunteers' memory on six people in the increasing/high category and five people in the decreasing/moderate group. The groups did not differ on tests of immediate memory, but the increasing/high cortisol group had other memory problems com- pared with those in the decreasing/moderate group. The researchers also found that the total volume of the hippocampus in those in the increasing/high group was 14% lower than those in the decreasing/moderate group, although there were no differences in other brain regions. The results suggest that "...brain aging can be accelerated by levels of adrenal hormones that are not generally regarded as pathological and that variation within this normal range is related to variation in the rate of brain aging," write Porter and Landfield. "This further suggests that chronic stress may accelerate the worsening of hippocampus. /

单选题Don't be afraid. I am not going to hurt you.A. fearB. astonishedC. hocked.D. frightened

单选题The earthquake has caused serious destruction to this city.A. damageB. dislikeC. instructionD. wound

单选题That apartment has been {{U}}vacant{{/U}} for over a month.

单选题The senator was offended by the reporter's silly questions.A. insultedB. rejoicedC. defendedD. rejected

单选题When machines become {{U}}outdated{{/U}} there is a tendency to move them into other departments that have not previously been computerized.

单选题There are numerous manuals available with instructions on how to fix a bicycle.

单选题The latest car model embodies the new research development.

单选题Dial direct when you can, and to be sure you call when Americans are in their offices, use the schedule at the left.A. tableB. paperC. noticeD. advertisement

单选题They always {{U}}mock{{/U}} me because I am ugly. A.smile at B.look down on C.belittle D.laugh at

单选题 下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题。{{B}}第一篇{{/B}} {{B}}Late-night Drinking{{/B}} Coffee lovers beware. Having a quick "pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 am and 4 am, before falling again. "It's the neurohormone that controls our sleep and tells our body when to sleep and when to wake," says Maurice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body's levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decaf. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decal They also took half an hour to drop off — twice as long as usual — and jigged around in bed twice as much. In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decal drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production. Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decaf after lunch.

单选题Staying Active in Old Age Keeps People Mobile People over 70 who aren"t active are more likely to develop problems walking or climbing stairs within a few years, according to a new study. These findings suggest that it"s very important to stay 1 in old age, study author Dr. Marjolein Visser told Reuters Health. "Physical activity in old age is as important 2 taking your medications(药物)," Visser noted. "You do not need to join an expensive, fancy sports club with high-tech (高科技的 ) equipment. Your body will already 3 from regular walking." Visser explained that 4 active helps prevent people from becoming breathless during simple activities, increase muscle mass and strength, and maintain the balance People need to walk up stairs, for instance. To investigate how important exercise is to older adults, Visser"s team interviewed 3,075 men and 5 between the ages of 70 and 79, all of whom said they had no problems walking one-quarter of a mile or climbing 6 . The investigators followed the subjects for 4-1/2 years, noting who developed problems 7 and climbing stairs. During the study,34 percent of men and 47 8 of women said they began to struggle with walking and climbing stairs. People 9 were inactive were twice as likely to report these problems as people who said they got regular exercise. People who didn"t exercise but had active lifestyles appeared to be at a somewhat higher risk of developing 10 walking and climbing stairs, relative to people who exercised 11 . Still, leading an active lifestyle appeared to protect people 12 problems better than being generally inactive, the researchers report in the Journal of the American Geriatrics (老年医学的) Society. Among people who were generally inactive, 13 who walked even a little bit—such as brisk (轻快的) walking for a little over an hour per week—were at a lower 14 of mobility (可动性) problems. "If you do not like to exercise or you cannot exercise 15 of serious health problems or functional limitations, do try to be as active as possible," Visser advised.

单选题According to the passage, happiness can be defined as

单选题Mr. Johnson {{U}}evidently{{/U}} regarded this as a great joke. A. readily B. casually C. obviously D. simply

单选题The river widens considerably as it begins to turn east.

单选题{{B}}第二篇{{/B}} {{B}}Diabetes (糖尿病) and Eye Damage{{/B}} Over 2 million Canadians have diabetes. It is the leading cause of blindness in North Americans under 65 years of age. Diabetes is a condition where the body either cannot produce enough insulin (胰岛素) or cannot respond properly to insulin. Insulin is important because it moves glucose (葡萄糖), a simple sugar, into the body's cells from the blood. The food people eat provides the body with glucose, which is used by the cells as a source of energy. If insulin isn't available or doesn't work correctly to move glucose from the blood into the cells, glucose will stay in the blood, leading to high blood sugar levels. High blood sugar levels damage the blood vessels, including the tiny blood vessels in the eye. This leads to an eye disease known as diabetic retinopathy (糖尿病型视网膜病). The retina (视网膜) is an area at the back of the eye that changes light into nerve signals. With diabetic retinopathy, some blood vessels in the retina are lost, and some of the other blood vessels begin to "leak" blood. This causes the retina to swell, and gradually cuts off its supply of oxygen and nutrients (滋养物). Eventually, the retina starts to grow new blood vessels to replace the damaged ones. Unfortunately, these new vessels are not as strong as the old ones. They are more likely to break, causing bleeding in the eye. At first, people with diabetic retinopathy will not notice any symptoms. As the disease gets worse, they may notice blurred (模糊的) vision, black spots or flashing lights. As time goes on, it can progress to blindness. Everyone with diabetes is at risk for diabetic retinopathy, and the risk increases the longer you've had diabetes. Fortunately, you can reduce your risk. If you do not have diabetes, but think you may be at risk for this condition, visit your doctor to be screened for diabetes. If you do have diabetes: · Have frequent eye check-ups. · Make sure that you monitor your blood sugar frequently and use your medications as recommended by your doctor. There is evidence to show that keeping your blood sugar under tight control can slow down eye damage. · If you have high blood pressure, follow your recommended diet and medications to keep it under control. If you are not sure whether you have high blood pressure, or whether your blood pressure is under control, discuss this with your doctor.