单选题In the third paragraph, "two continents' refer to ______.

单选题According to the author, which of the following is most likely studied nowadays by psychologists?

单选题One can ______ even from one's unpleasant experiences.

单选题The man (was) seen run (away with) something black (under) (his arm).

单选题Two techniques have recently been developed to simplify research and reduce the number of nonhuman primates needed in studies of certain complex hormonal reactions. One technique involves the culturing of primate pituitary cells and the cells of certain human turnouts. In the other, animal oviduct tissue is transplanted under the skin of laboratory primates. Both culturing techniques complement existing methods of studying intact animals. With an in vitro culturing technique, researchers are deciphering how biochemical agents regulate the secretion of prolactin, the pituitary hormone that promotes milk production. The cultured cells survive for as long as a month, and they do not require serum, a commonly used culture ingredient that can influence cellular function and confound study results. One primate pituitary gland may yield enough cells for as many as 72 culture dishes, which otherwise would require as many animals. The other technique allows scientists to monitor cellular differentiation in the reproductive tracts of female monkeys. While falling short of the long-sought goal of developing an in vitro model of the female reproductive system, the next-best alternative was achieved. The method involves transplanting oviduct tissue to an easily accessible site under the skin, where the grafted cells behave exactly as if they were in their normal environment. In about 80 percent of the grafts, blood vessels in surrounding abdominal skin grow into and begin nourishing the oviduct tissue. Otherwise, the tissue is largely isolated, walled off by the surrounding skin. A cyst forms that shrinks and swells in tandem with stages of the menstrual cycle. With about 80 percent of the grafts re-establishing themselves in the new site, a single monkey may bear as many as 20 miniature oviducts that are easily accessible for study. Because samples are removed with a simple procedure requiring only local anaesthesia, scientists can track changes in oviduct cells over short intervals. In contrast, repeated analysis of cellular changes within the oviduct itself would require abdominal surgery every time a sample was taken--a procedure that the animals could not tolerate. Scientists are using the grafting technique to study chlamydia infections, a leading cause of infertility among women. By infecting oviduct tissues transplanted into the abdominal skin of rhesus monkeys, researchers hope to determine how the bacteria cause pelvic inflammatory disease and lesions that obstruct the oviduct. Such research could eventually lead to the development of antibodies to the infectious agent and a strategy for producing a chlamydia vaccine.

单选题Thanks to closed doors and fierce gatekeepers, bosses are tricky to observe in their natural habitat. Yet it might be useful to know what they do all day, and whether any of it benefits shareholders. A new Harvard Business School working paper sheds some light. Researchers asked the chief executives of 94 Italian firms to have their assistants record their activities for a week. You may take this with a gain of salt. Is the boss' assistant a neutral observer? If the boss spends his lunch hour drinking a lot, or in a motel with his assistant, will she record this truthfully? Nonetheless, here are the results. The average Italian boss works for 48 hours a week and spends 60% of that time in meetings. The most diligent put in another 20 hours. And the longer they work, the better the company does. Less diligent chief executives are more likely to have one-to-one meetings with people from outside the company. The authors speculate that such people are trying to raise their own profile, perhaps to secure a better job. Bosses who work longer hours, by contrast, spend more of them meeting their own employees. Bosses often complain that they get bogged down in day-to-day operations, says Rajesh Chandy, a professor at the London Business School. Regulations that make them legally responsible for their underlings' wrongdoings are partly to blame. The prospect of jail is a powerful attention- grabber. Many bosses also feel they must dash around the world pitching to clients. Mr. Chandy thinks bosses should spend less time with clients and more time thinking about the future. How much time they spend thinking about anything is hard to measure. But in an experiment, Mr Chandy measured how often bosses use forward-looking words like "will" and "shall" in their public statements. He concluded that bosses spend only 3%～4% of their day thinking about long-term strategy. Brian Sullivan, the chief executive of CTPartners, a headhunting firm, says the most difficult part of his job is saying no to people who want a piece of his time. Mr. Sullivan says the only time he gets for blue-sky thinking is when he is in the sky. Bill Gates took regular "think weeks", when he would sit alone in a cabin for 18 hours a day reading and contemplating. This, it is said, led to such strategic masterstrokes as "the Internet tidal wave memo" in 1995, which shifted Microsoft's focus to the web. But not every boss thinks he needs more time for thinking. "You can hire McKinsey to do that for you." says one.

单选题The______they felt for each other was obvious to everyone who saw them.(中国矿业大学2008年试题)

单选题Some individuals, however, have strong moral and religious beliefs A that view abortionas an act of murder and B thus to believe that the C "right to life" of an unborn child should D take precedence over .

单选题He has quite a lot of interesting magazines but I have ______.A. noB. noneC. no oneD. neither

单选题______, that step is not safe.

单选题Though he would one day be considered an innovator and founding father of the artistic movement known as Impressionism, Claude Monet(1840-1926)began his career as a fairly traditional representational artist. His painting gradually changed, however, as he became interested in light and how it affects perception—an interest that led him to attempt to paint light itself rather than the objects off of which light reflected. Monet also rejected the tradition of painting in a dedicated studio, and left the confines of his dusty room to paint outside. Many of his friends and fellow artists, including Pisarro, Renoir and Cezanne, were also interested in working alfresco and joined him in painting outdoors. This group, the core of the movement that would later be classified as Impressionism, made it a common practice to paint the same scene many times in a day to explore the changes in the light, using small patches of color rather than the large brush strokes and blended color that had characterized artistic technique until that time. The Impressionists were thus attempting to evoke a mood rather than document a specific scene or event, as had been the aim of earlier painters. This move away from representation was also effected by a technological development, as photography became more affordable and popular. Before the development of photography, painting was the primary means of documenting the marriages, births, and business successes of the wealthy. Photographers soon took over much of this role because photographs were faster, more accurate, and less expensive than paintings. This freed the Impressionists to find new roles for their medium and encouraged the public to think about painting in a new way. It was no longer just a means of recording significant events; it now reflected an artist"s unique vision of a scene or moment. Today, Impressionism enjoys a privileged position with many art historians and critics, although this was certainly not always the case. As the movement was developing, most critics were at best uninterested and often appalled by the work. Even the name of the movement was originally a derisive critique. A critic who, like most of his colleagues, prized realism in paintings, declared the movement "Impressionism" after the name of the painting Impression: A Sunrise, by Monet. The critic considered the Impressionists" works unfinished—only an impression, rather than a complete painting. It is safe to say that such a critic would be in the minority today, however. Impressionist paintings are now some of the most prized works in the art world. Museums and individuals pay huge sums to add these works to their collections, and the reproductions of the artworks are among the most popular fine art posters sold.

单选题It can be inferred from the passage that it is of vital importance that ______. A．one makes money by selling his personal data B．one conceals his identity when using the Internet C．one keeps his personal information at the office D．one goes online as often as he can

单选题Every culture has developed ______ for certain kinds of food and drink, and equally strong negative attitudes toward others. A) preferences B) expectations C) fantasies D) fashions

单选题It is implied in Paragraph 2 that ______.

单选题A. cookB. woodC. bootD. childhood

单选题It is ______ that my nephew is really fond of classic music, which he has been exposed to (熏陶)for years.A. trueB. realC. correctD. right

单选题By almost every measure, Paul Pfingst is an unsentimental prosecutor. Last week the San Diego County district attorney said he fully intends to try suspect Charles Andrew Williams, 15, as an adult for the Santana High School shootings. Even before the tragedy, Pfingst had stood behind the controversial California law that mandates treating murder suspects as young as 14 as adults. So nobody would have wagered that Pfingst would also be the first D. A. in the U. S. to launch his very own Innocence Project. Yet last June, Pfingst told his attorneys to go back over old murder and rape convictions and see if any unravel with newly developed DNA-testing tools. In other words, he wanted to revisit past victories — this time playing for the other team. " I think people misunderstand being conservative for being biased," says Pfingst. " I consider myself a pragmatic guy, and I have no interest in putting innocent people in jail. " Around the U. S. , flabbergasted defense attorneys and their jailed clients cheered his move. Among prosecutors, however, there was an awkward pause. After all, each DNA test costs as much as $5, 000. Then there's the unspoken risk: if dozens of innocents turn up, the D. A. will have indicted his shop. But nine months later, no budgets have been busted or prosecutors ousted. Only the rare case merits review. Pfingst's team considers convictions before 1993, when the city started routine DNA testing. They discard cases if the defendant has been released. Of the 560 remaining files, they have re-examined 200, looking for cases with biological evidence and defendants who still claim innocence. They have identified three so far. The most compelling involves a man serving 12 years for molesting a girl who was playing in his apartment. But others were there at the time. Police found a small drop of saliva on the victim's shirt — too small a sample to test in 1991. Today that spot could free a man. Test results are due any day. Inspired by San Diego, 10 other counties in the U. S. are starting DNA audits.

单选题The nurses in this hospital are most ______ of the patients.