单选题The patient is not in good condition, so do not ______ your visit. A. lengthen B. delay C. extend D. prolong

单选题The Second Hague Disarmament Conference of 1907 was marked more by discord than discourse, a sign of the Udeteriorating/U world situation.

单选题Your nerve system reacts (to) (what) you imagine to be true (on much the same way) that it (does) to real experiences.

单选题阅读下列短文，然后根据短文的内容从每小题的四个选择项中选出最佳的一项。B　　Maria Mitchell（1818-1889）,the first woman asdivonomer（天文学家）in the United was born in Nantucket, Massachusetts.Her parents valued education and insisted on giving

单选题Human beings are superior to animals ______ they can use language as tool to communicate.

单选题Persons' remarks are mentioned at the beginning of the text to______.

单选题We accept anybody regardless ______ nationality.

单选题Springtime displays of fruit blossoms in the Shenandoah Valley ______ thousands of tourists each year.

单选题The lecturer said "It's time you ______ the literature review." A. began B. begin C. should begin D. are beginning

单选题It is these poisonous products ______ can cause the symptoms of the flu, such as headache and aching muscles. A) who B) that C) how D) what

单选题My father asked __ to help with his work.

单选题 Trying too Hard Can Slow New Language Development A. Neuroscientists have long observed that learning a language presents a different set of opportunities and challenges for adults and children. B. Adults easily grasp the vocabulary needed to navigate a grocery store or order food in a restaurant, but children have an innate ability to pick up on subtle nuances of language that often elude adults. For example, within months of living in a foreign country, a young child may speak a second language like a native speaker. C. Experts believe that brain structure plays an important role in this 'sensitive period' for learning language, which is believed to end around adolescence. The young brain is equipped with neural circuits that can analyze sounds and build a coherent set of rules for constructing words and sentences out of those sounds. Once these language structures are established, it's difficult to build another one for a new language. D. In a new study, a team of neuroscientists and psychologists from Massachusetts Institute of Technology (MIT) discovered another factor that contributes to adults' language difficulties: When learning certain elements of language, adults' more highly developed cognitive skills actually get in the way. E. The researchers discovered that the harder adults tried to learn an artificial language, the worse they were at deciphering the language's morphology—the structure and deployment of linguistic units such as root words, suffixes, and prefixes. F. 'We found that effort helps you in most situations, for things like figuring out what the units of language that you need to know are, and basic ordering of elements. But when trying to learn morphology, at least in this artificial language we created, it's actually worse when you try,' said Amy Flynn a postdoc at MIT's McGovern Institute for Brain Research. G. Finn and colleagues from the University of California at Santa Barbara, Stanford University, and the University of British Columbia describe their findings in journal PLOS ONE. H. Linguists have known for decades that children are skilled at absorbing certain tricky elements of language, such as irregular past participles (examples of which, in English, include 'gone' and 'been') or complicated verb tenses like the subjunctive. 'Children will ultimately perform better than adults in terms of their command of the grammar and the structural components of language—some of the more idiosyncratic, difficult-to-articulate aspects of language that even most native speakers don't have conscious awareness of,' Finn says. I. In 1990, linguist Elissa Newport hypothesized that adults have trouble learning those nuances because they try to analyze too much information at once. Adults have a much more highly developed prefrontal cortex than children, and they tend to throw all of that brainpower at learning a second language. J. This high-powered processing may actually interfere with certain elements of learning language. 'It's an idea that's been around for a long time, but there hasn't been any data that experimentally show that it's true,' Finn says. Finn and her colleagues designed an experiment to test whether exerting more effort would help or hinder success. The study K. First, they created nine nonsense words, each with two syllables. Each word fell into one of three categories (A, B, and C), defined by the order of consonant and vowel sounds. Study subjects listened to the artificial language for about 10 minutes. One group of subjects was told not to overanalyze what they heard, but not to tune it out either. L. To help them not overthink the language, they were given the option of completing a puzzle or colouring while they listened. The other group was told to try to identify the words they were hearing. Each group heard the same recording, which was a series of three-word sequences—first a word from category A, then one from category B, then category C—with no pauses between words. M. Previous studies have shown that adults, babies, and even monkeys can parse this kind of information into word units, a task known as word segmentation. Subjects from both groups were successful at word segmentation, although the group that tried harder performed a little better. Both groups also performed well in a task called word ordering, which required subjects to choose between a correct word sequence (ABC) and an incorrect sequence (such as ACB) of words they had previously heard. N. The final test measured skill in identifying the language's morphology. The researchers played a three-word sequence that included a word the subjects had not heard before, but which fit into one of the three categories. O. When asked to judge whether this new word was in the correct location, the subjects who had been asked to pay closer attention to the original word stream performed much worse than those who had listened more passively. The findings support a theory of language acquisition that suggests that some parts of language are learned through procedural memory, while others are learned through declarative memory. P. Under this theory, declarative memory, which stores knowledge and facts, would be more useful for learning vocabulary and certain rules of grammar. Procedural memory, which guides tasks we perform without conscious awareness of how we learned them, would be more useful for learning subtle rules related to language morphology. Q. 'It's likely to be the procedural memory system that's really important for learning these difficult morphological aspects of language. In fact, when you use the declarative memory system, it doesn't help you, it harms you,' Finn says. Still unresolved is the question of whether adults can overcome this language-learning obstacle. Finn says she does not have a good answer yet but she is now testing the effects of 'turning off' the adult prefrontal cortex using a technique called transcranial magnetic stimulation. R. Other interventions she plans to study include distracting the prefrontal cortex by forcing it to perform other tasks while language is heard, and treating subjects with drugs that impair activity in that brain region.

单选题His wife says that he was more {{U}}frugal{{/U}} in his youth than later years.

单选题The football game comes to you ______ from New York. [A] lively [B] alive [C] live [D] living

单选题So much of modem fiction in the United States is autobiographical, and so much of the autobiography fictionalized, that the______ sometimes seem largely

单选题What we have to take ______ the courses offered only for this term.

单选题The domestic economy in the United States expanded in a remarkably vigorous and steady fashion. The revival in consumer confidence was reflected in the higher proportion of incomes spent for goods and services and the marked increase in consumer willingness to take on installment debt. A parallel strengthening in business psychology was manifested in a stepped-up rate of plant and equipment spending and a gradual pickup in expenses for inventory. Confidence in the economy was also reflected in the strength of the stock market and in the stability of the bond market. For the years as a whole, consumer and business sentiment benefited from the ease in East-West tensions. The bases of the business expansion were to be found mainly in the stimulative monetary and fiscal policies that had been pursued. Moreover, the restoration of sounder liquidity positions and tighter management control of production efficiency had also helped lay the groundwork for a strong expansion. In addition, the economic policy moves made by the President had served to renew optimism on the business outlook while boosting hopes that inflation would be brought under more effective control. Final]y, of course, the economy was able to grow as vigorously as it did because sufficient leeway existed in terms of idle men and machines. The United States balance of payments deficit declined sharply. Nevertheless, by any other test, the deficit remained very large, and there was actually a substantial deterioration in our trade account to a sizable deficit, almost two-thirds of which was with Japan. While the overall trade performance proved disappointing, there are still good reasons for expecting the delayed impact of devaluation to produce in time a significant strengthening in our trade picture. Given the size of the Japanese component of our trade deficit, however, the outcome will depend importantly on the extent of the corrective measures undertaken by Japan. Also important will be our own efforts in the United States to fashion internal policies consistent with an improvement in our external balance. The underlying task of public policy for the year ahead--and indeed for the longer run--remained a familiar one: to strike the right balance between encouraging healthy economic growth and avoiding inflationary pressures. With the economy showing sustained and vigorous growth, and with the currency crisis highlighting the need to improve our competitive posture internationally, the emphasis seemed to be shifting to the problem of inflation. The Phase Three Program of wage and price restraint can contribute to reducing inflation. Unless productivity growth is unexpectedly large; however, the expansion of real output must eventually begin to slow down to the economy"s larger run growth potential if generalized demand pressures on prices are to be avoided.

单选题Claude-Oscar Monet 1840 -- 1926 was a French artist and a leading member of the Impressionist group of painters. Born in Paris, Monet spent his childhood in Le Havre. There he met a local artist, Eu

单选题Professor Taylor's talk has indicated that science has a very strong______on the everyday life of non-scientists as well as scientists. A. motivation B. perspective C. impression D. impact