单选题The workers finally called off the strikes.______

单选题What Is Cancer? Cancer is actually a group of many related diseases that all have to do with cells. Cells are the very small units that make up all 1 things, including the human body. There are billions of cells 2 each person"s body. Cancer happens when cells that are not normal grow 3 spread very fast. Normal body cells grow and divide and know when to stop growing. Over time, they also die. 4 these normal cells, cancer cells just continue to grow and divide out of control and don"t die. Cancer cells usually group together to form tumors (肿瘤). A growing tumor becomes a lump of cancer cells 5 can destroy the normal cells around the 6 and damage the body"s healthy tissues. This can make someone very 7 . Sometimes cancer cells break away from the original tumor and travel to other areas of the 8 , where they keep growing and can go on to form new tumors. This is how cancer 9 . The spread of a tumor to a new place in the body is 10 metastasis (转移). People with cancer may feel pretty sick at times—but cell usually still do lots of normal things. 11 they are very sick, kids and teenagers with cancer may still be able to go to school. They may be tired or bruise (出现青肿) easily, but they 12 sometimes go to camp, movies, and sleepover (在外过夜的) parties. People with cancer still like the same things they did 13 they got sick. Cancer in kids is rare—but today, many kids who do get cancer go on living normal lives. The number of kids who beat cancer goes 14 every year because of new cancer treatments. So a lot of kids with cancer will some day drive cars, go to college, have careers, and even get 15 and have families of their own.

单选题The unemployment rate may rise slightly.A. a lotB. a littleC. quicklyD. sharply

单选题Cell Phone Lets Your Secret Out Your cell phone holds secrets about you. Besides the names and (51) that you've programmed into it, traces of your DNA linger (逗留) on the device, according to a new study. DNA is genetic material that (52) in every cell. Like your fingerprint, your DNA is unique to you (53) you have an identical twin. Scientists today routinely analyze DNA in blood, saliva (唾液), or hair left (54) at the scene of a crime. The results often help detectives identify (55) and their victims. Your cell phone can reveal more about you (56) you might think. Meghan J. McFadden, a scientist at McMaster University in Hamilton, Ontario, heard about a crime in which the suspect bled onto a cell phone and later dropped the (57) . This made her wonder whether traces of DNA lingered on cell phones even when no blood was involved. (58) , she and colleague Margaret Wallace of the City University of New York analyzed the flip-open phones of 10 volunteers. They used swabs (药签) to collect (59) traces of the users from two parts of the phone: the outside, where the user holds it, and the (60) , which is placed at the user's ear. The scientists scrubbed the phones using a solution made mostly (61) alcohol. The aim of washing was to remove all detectable traces of DNA. The owners got their phones (62) for another week. Then the researchers collected the phones and repeated the swabbing of each phone once more. The scientists discovered DNA that (63) to the phone's speaker on each of the phones. Better samples were collected from the outside of each phone, but those swabs also picked up DNA that belonged to other people who had apparently also handled the phone. (64) , DNA showed up even in swabs that were taken immediately after the phones were scrubbed (擦洗). That suggests that washing won't remove all traces of evidence from a criminal's device. So cell phones can now be added to the (65) of clues that can decide a crime-scene investigation.

单选题3. Diabetes (糖尿病) Most of the food we eat is turned into glucose (葡萄糖) for our bodies to use for energy. The pancreas (胰腺), an organ near the stomach, makes a hormone called insulin (胰岛素) to help glucose get into your body cells. When you have diabetes, your body either doesn' t make enough insulin or can' t use its own insulin well. This problem causes glucose to build up in your blood. You may recall having some of these signs before you found out you had diabetes: * Being very thirsty. * Urinating (小便) a lot - often at night. * Having unclear vision from time to time. * Feeling very tired much of the time. * Losing weight without trying. * Having very dry skin. * Having sores that are slow to heal. * Getting more infections than usual. * Vomiting. Two main types of diabetes are Type 1 and Type 2. Another type of diabetes appears during pregnancy in some women. It's called gestational (妊娠) diabetes. One out of ten people with diabetes has Type 1 diabetes~ These people usually find out they have diabetes when they are children or young adults. The pancreas of a person with Type 1 makes little or no insulin. People with Type 1 diabetes must inject insulin every day to live. Most people with diabetes have Type 2 diabetes. The pancreas of people with such diabetes keeps making insulin for some time, but the body can' t use it well. Most people with Type 2 find out about their diabetes after age 30 or 40. Some risk factors which make people more likely to get Type 2 diabetes are: * A family history of diabetes. * Lack of exercise. * Weighing too much. Diabetes can hurt your eyes, your kidneys, and your nerves. It can lead to problems with the blood circulation in your body. Even your teeth and gums (齿龈) can be harmed. And diabetes in pregnancy can cause special problems.

单选题Not surprisingly, many of the non - surgical procedures are offered at hotel spas. The Leading Hotels of the World, a luxury hospitality organization representing more than 450 hotels, resorts, and spas, has the widest range of alternatives in a variety of Countries. The Hotel Carlsbad Plaza in the Czech Republic offers cryotherapy, where guests, mainly locals, stay for several minutes in a room where the temperature is below freezing. The goal is to stimulate free - flowing collagen, the main hormone responsible for a silky- smooth complexion, which is plentiful in youth but fades with age. Locals also can't get enough of the dry carbon -dioxide bath, which wraps the body in a plastic bag filled with the natural gas, reducing swelling and allergic reactions, and healing any scars. At the Terme di Saturnia Spa&Golf Resort in Maremma, Italy, clients can try Isophoresis, all alternative to liposuction (吸脂法) that uses ultrasound to force vitamins anti plant extracts below the skin to break down fat deposits. They dissolve into the bloodstream and areeliminated through the bowels and kidneys. The non- surgical procedures are conductedA. at local hospitals.B. at hotel spas.C. at beauty saloons.D. at grand hotels.

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. Mar-jolein 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) Society. Among people who were generally inactive, 13 who walked even a little bit—such as brisk (轻快地) 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This mail I wrote to my mom was delivered this morning.

单选题The reason for their unusual behavior remains a puzzle .

单选题{{B}}第三篇{{/B}} {{B}} High Stress May Damage Memory{{/B}} 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 Land- field 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 S 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 compared 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The thief was finally captured two miles away from the village.

单选题Insurance Whole life is permanent insurance protection that protects you for your whole life, from the day you purchase the policy until you die, as long as you pay the premiums (保险费). Whole life can be a solid foundation. Upon this foundation you can build a long-term financial plan, because it guarantees lifetime protection for your family or business. Whole life insurance provides basic insurance protection, plus Mortgage protection, Estate preservation, Retirement funding, Charitable giving, Business needs... A life insurance agent will help you determine an amount of insurance needed to protect your family or business in the event of your death. Generally after the first year, the policy begins to increase cash value. The amount of cash value in your policy usually increases every year. This money can be used to help purchase a home, fund a child's education, add to retirement income, or for any other purpose. You may also choose to leave it in the policy and allow it to grow. A whole life policy can earn dividends. Dividends are determined by the company's board of directors each year and are not guaranteed. When a dividend is payable, you may choose to take it in cash, use it to buy more insurance or to pay or reduce your premiums. When you die, the company will pay your beneficiaries the death benefit, usually the face amount of the policy plus any dividend. This money is generally received by the beneficiaries free from income tax.

单选题Paul Revere made his famous midnight ride to warn American patriots that the enemy was coming. A. admonish B. alert C. ensure D. remind

单选题According to the passage, the adrenalin level in your blood rises when

单选题A seed planted in the sensitive lining of an oyster begins a perpetual coating process that forms a pearl.

单选题When he spoke, she had an unpleasant insight into what life would be like as his wife. A. perception B. precept C. precede D. preceptor

单选题The brain controls the other body activities through

单选题He hated coming home to the empty house.A. dislikedB. wishedC. suggestedD. disgusted

单选题Police officers working on the murder have questioned hundreds of families.A. askedB. demandedC. inquiredD. requested

单选题They had a far better yield than any other farm miles away around this year.