单选题He ______ his letter of application to the director of the Personnel Department of that company.

单选题Nature constantly Uyields to/U man in New York: witness those fragile side walk trees gamely straggling against encroaching cement and petrol fumes.

单选题At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th century. Born with an extremely rare and usually fatal disorder that left her without a functioning immune system (the "bubble-boy disease", named after an earlier victim who was kept alive for years in a sterile plastic tent), she was treated beginning in 1990 with a revolutionary new therapy that sought to correct the defect at its very source, in the genes of her white blood cells. It worked. Although her last .gene-therapy treatment was in 1992, she is completely healthy with normal immune function, according to one of the doctors who treated her, W. French Anderson of the University of Southern California. Researchers have long dreamed of treating diseases from hemophilia to cancer by replacing mutant genes with normal ones. And the dreaming may continue for decades more. "There will be a gene-based treatment for essentially every disease, " Anderson says, "within 50 years. " It's not entirely clear why medicine has been so slow to build on Anderson's early success. The National Institutes of Health budget office estimates it will spend $432 million on gene-therapy research in 2005, and there is no shortage of promising leads. The therapeutic genes are usually delivered through viruses that don't cause human disease. "The virus is sort of like a Trojan horse," says Ronald Crystal of New York Presbyterian/Weill Comell Medical College. "The cargo is the gene." At the University of Pennsylvania's Abramson Cancer Center, immunologist Carl June recently treated HIV patients with a gene intended to help their cells resist the infection. At Comell University, researchers are pursuing gene-based therapies for Parkinson's disease and a rare hereditary disorder that destroys children's brain cells. At Stanford University and the Children's Hospital of Philadelphia, researchers are trying to figure out how to help patients with hemophilia who today must inject themselves with expensive clotting drugs for life. Animal experiments have shown great promise. But somehow, things get lost in the translation from laboratory to patient. In human trials of the hemophilia treatment, patients show a response at first, but it fades over time. And the field has still not recovered from the setback it suffered in 1999, when Jesse Gelsinger, an 18-year-old with a rare metabolic disorder, died after receiving an experimental gene therapy at the University of Pennsylvania. Some experts worry that the field will be tarnished further if the next people to benefit are not patients but athletes seeking an edge. This summer, researchers at the Sulk Institute in San Diego said they had created a "marathon mouse" by implanting a gene that enhances running ability; already, officials at the World Anti-Doping Agency are preparing to test athletes for signs of "gene doping". But the principle is the same, whether you're trying to help a healthy runner run faster or allow a muscular-dystrophy patient to walk. "Everybody recognizes that gene therapy is a very good idea," says Crystal. "And eventually it's going to work".

单选题To cope with this problem, we should try to______ourselves______the traditions and customs of other nations.

单选题— I have two suggestions: one is to go to the cinema, the other is to have a drink. — Well, personally I prefer the ______ one. I don't like films very much.A. lateB. latterC. latestD. last

单选题 The oceans are the main source of humidity, but plants also pour moisture into the air. In one day, a five - acre forest can release 20, 000 gallons of water, enough to fill an average swimming, pool. A dryer extracts moisture from wet clothes, adding to humidity. Even breathing contributes to this sticky business. Every time we exhale, we expel nearly one pint of moist air into the atmosphere. Using sophisticated measuring devices, science is learning more and more about the far - reaching and often surprising impact humidity has on all of us. Two summers ago angry callers phoned American Television and Communications Corp. ' s cable - TV operation in northeastern Wisconsin, complaining about fuzzy pictures and poor reception. "What happened," said the chief engineer, "was that the humidity was interfering with our signals. "When a blast of dry air invaded the state, the number of complaints dropped sharply. Humidity plays hob with our mechanical world as well. Water condensation on the playing beads and tapes of videocassette recorders produces a streaky picture. Humidity shortens the life of flashlight and smoke - detector batteries. When the weather gets sticky, the rubber belts that power the fan, air conditioner and alternator under the hood of our cars can get wet and squeak. Moisture also causes pianos to go out of tune, often in no time flat. At the Wolf Trap Farm Park for the Performing Arts in Vienna, Va. , pianos are tuned twice a day during the summer concert season. Often a tuner stands in the wings, ready to make emergency adjustments during performances. Humidity speeds the deterioration of treasured family photos and warps priceless antiques. Your home' s wooden support beams, doors and window framers absorb extra moisture and expand - swelling up to three percent depending on the wood, its grain and the setting. Too much moisture promotes blight that attacks potato and green - bean crops--adding to food costs. It also causes rust in wheat, which can affect grain- product prices. Humidity affects our health, as well. We get more migraine headaches, ulcer attacks, blood clots and skin rashes in hot, humid weather. Since 1987, the Health, Weight and Stress Clinic at Johns Hopkins Hospital in Baltimore has tested over 1700 patients for responses to high humidity. They have reported increased dizziness, stomachaches, chest pains, cramps, and visual disturbances such as double and blurred vision.

单选题Music comes in many forms; most countries have a style of their own【C1】______the turn of the century when jazz was born, America had no prominent【C2】______of its own. No one knows exactly when jazz was【C3】______, or by whom. But it began to be【C4】______in the early 1900s. Jazz is America' s contribution to【C5】______music. In contrast to classical music, which【C6】______formal European traditions, jazz is spontaneous nod free-form. It bubbles with energy, 【C7】______the moods, interests, and emotions of the people. In the 1920s, jazz【C8】______like America. And【C9】______it does today. The【C10】______of this music are as interesting as the music【C11】______. American Negroes, or blacks, as they are called today, were the jazz【C12】______They were brought to the Southern states【C13】______slaves. They were sold to plantation owners and forced to work long【C14】______When a Negro died his friends and relatives【C15】______a procession to carry the body to the cemetery. In New Orleans, a band often accompanies the【C16】______. On the way to the cemetery the band played slow, solemn music suited to the occasion. 【C17】______on the way home the mood changed. Spirits fired. Death had removed one of their【C18】______, but the living were glad to be alive. The band played【C19】______music, improvising on both the harmony and the melody of the times【C20】______at the funeral. This music made everyone want to dance. It was an early form of jazz.

单选题When we credit the successful people with intelligence, physical strength or good luck we are making excuses for ourselves because we fall ______ in all three.(2002年中国人民大学考博试题)

单选题The National ______ contains many valuable pictures.

单选题The author tries to convince us that

单选题When it comes to jealousy, men and women aren't always on the same page. Previous studies have shown that, while men are more likely to see red over a partner's sexual infidelity, women are more upset by emotional cheating. Evolutionary psychologists- theorize that the difference is rooted in the sexes' historical roles--men wanted to guarantee that their partners were carrying their children, while women needed to feel secure that they and their children would be cared for by a committed partner. Yet, that evolutionary explanation doesn't account for a large group of men who say that emotional disloyalty is more upsetting than sexual infidelity, and women who are more upset by sexual betrayal. To gain a more thorough understanding of gender and jealousy, researchers from Pennsylvania State University (PSU) approached the issue with some modem psychology. In a study published in the journal Psychological Science, researchers found that, while generally speaking, the evolutionary explanation of gender and jealousy held up, when viewed through the lens of attachment theory--broadly, the psychological theory about our tendency to foster intimate relationships with other people--both men and women with secure emotional histories were more likely to experience jealousy over emotional infidelity, and those who were insecure or dismissing, were more likely to be vexed by sexual cheating. To tackle the issue, researchers recruited 416 college students from New York City, whose attachment styles were assessed through questionnaires containing a series of vignettes (short descriptions or pictures)--each reflecting either secure, fearful, preoccupied, or dismissing attachment styles. Participants were instructed to select the story that most accurately reflected their own attitude about romantic relationships, and were categorized accordingly. In a subsequent questionnaire, participants were asked whether they would be more upset by their partner "having passionate sexual intercourse with another person," or "forming a deep emotional attachment to another person." They found that, regardless of gender, 77.3% of securely attached participants viewed emotional infidelity as more upsetting, while 64.8% of insecure or dismissing participants thought sexual cheating was worse. These findings, the authors say, shed light on the intricate psychological nature of jealousy, and may help to develop techniques to determine the underlying dynamics of sexual jeaiousy--a well-documented cause of spousal abuse, beating and even murder. The authors suggest that, gaining a better understanding of not only the broad differ ences in jealousy between the sexes, but of the differences in jealousy within genders, may help to identify methods for interrupting abuse by fostering stable, secure attachments.

单选题{{B}}Passage Four{{/B}} British Columbia is a province in the western half of Canada. It is the largest province in the western half of Canada, but two other provinces are larger. The weather in the southern half of British Columbia is mild. In fact, it is the mildest in Canada. For this reason, many older people come to live in this area of Canada. There are about three and a half million people living in British Columbia. Only Ontario and Quebec have more people, about half of British Columbia's people originally came from England. Many other people's families came to Canada from Scotland, Ireland, and Germany. Today this province has a higher percentage of Asians than any of the Other nine provinces. Vancouver is the largest city in British Columbia. Many international visitors come to Vancouver. They come to see the natural beauty of the coast and the beautiful mountains. Many ships stop at Vancouver, and it is the largest port in all of Canada.

单选题The main trouble is______enough knowledge.

单选题I am used ______ my sleep interrupted. A. to have B. having C. have D. to having

单选题 A serious critic has to comprehend the particular content, unique structure, and special meaning of a work of art. And here she faces a dilemma. The critic must recognize the artistic element of uniqueness that requires subjective reaction; yet she must not be unduly prejudiced by such reactions. Her likes and dislikes are less important than what the work itself communicates, and her preferences may blind her to certain qualities of the work and thereby prevent an adequate understanding of it. Hence, it is necessary that a critic develop a sensibility informed by familiarity with the history of art and aesthetic theory. On the other hand, it is insufficient to treat the artwork solely historically, in relation to a fixed set of ideas or values. The critic's knowledge and training are, rather, a preparation of the cognitive and emotional abilities needed for all adequate personal response to an artwork's own particular qualities.

单选题The television series mentioned is healthy in that______

单选题Those who want more economic growth believe that continued economic growth ______. A. is essential to the well-being of society as a whole B. can provide the solution to many of our social problems today C. can protect our environment from being polluted by industry D. can provide us with more natural resources for industrialization

单选题All bad things are interconnected, and any one of them is______to be the cause of any other.