单选题The primary objective of Basic Econometric, is to provide an elementary but a comprehensive introduction to the art and science of econometrics.

单选题Whether a person likes a routine office job or not depends largely on {{U}}temperament{{/U}}.

单选题Have you ever felt your life go into slow motion as you realize something bad is happening? You might have just knocked over a wine glass or noticed a car hurtling towards you, for example. Now scientists have measured exactly how much these attention-grabbing events slow down our perception of the world around us. Another example of the world appearing to slow down is when you are hanging on the phone waiting for someone to pick up at the other end. If your attention wanders while you're waiting then suddenly switches back, you will probably hear what seems like a longer than usual silence before hearing the dialing tone again. For you, time will have momentarily slowed. To see how our perception of time changes when something new happens, Vincent Walsh and his colleagues put headphones on volunteers and played eight beeps to their right ears. The gap between each beep was exactly 1 second, except for the gap between the fourth and fifth beeps, which the scientists could make shorter or longer. They altered the length of this gap until the volunteers estimated it was the same length as the other gaps. The researchers found that, on average, people judge a second slightly short, at 955 milliseconds. In the second part of the experiment, the first four beeps were played to the subjects' right ears, but the other four were then played to their left. Again, the volunteers were asked to estimate when the gap between the fourth and fifth beeps was the same as the others. This time they judged a second to be even shorter at 825 milliseconds long. Perceiving a second to be much shorter than it is makes you feel as though the world has gone into slow motion, since less happens in that slice of time. Walsh thinks the effect could have evolved to give us a fraction more time to react to potentially threatening events. Last year, Kielan Yarrow, a British psychologist found a similar effect with vision. When you glance at a clock, the first second will seem longer than it really is. Yarrow's results showed that time appeared to slow down by a similar amount as Walsh found. Previous studies have shown that cooling the body slows down our perception of time while warming it up has the opposite effect.

单选题A boy 6 feet tall and weighing only 130 pounds is very ______.

单选题 The explosion of a star is an awesome event. The most violent of these cataclysms, which produce supernovae, probably destroys a star completely. Within our galaxy of roughly 100 billion stars the last supernova was observed in 1604. Much smaller explosions, however, occur quite frequently, giving rise to what astronomers call novae and dwarf novae. On the order of 25 novae occur in our galaxy every year, but only two or three are near enough to be observed. About 100 dwarf novae are known altogether. If the exploding star is in a nearby part of the galaxy, it may create a "new star" that was not previously visible to the naked eye. The last new star of this sort that could be observed clearly from the Northern Hemisphere appeared in 1946. In these smaller explosions the star loses only a minute fraction of its mass and survives to explode again. Astrophysicists are fairly well satisfied that they can account for the explosions of supernovae. The novae and dwarf novae have presented more of a puzzle. I shall describe recent investigations that have provided important new information about these two classes of exploding star. The picture that emerges is quite astonishing. It appears that every dwarf nova--and perhaps every nova--is a member of a pair of stars. The two stars are so close together that they revolve around a point that lies barely outside the surface of the larger star. As a result the period of rotation is usually only a few hours and their velocities range upward to within a two-hundredth the speed of light, Astronomers use the term "cataclysmic variable" to embrace the three general classes of exploding star: dwarf novae, novae, and supernovae. A cataclysmic variable is defined as a star that suddenly and unpredictably increases in brightness by a factor of at least 10. Dwarf novae are stars that increase in brightness by factor of 10 to 100 within a period of several hours and decline to their former brightness in two or three days. In this period they emit some 1038 to 1039 ergs of energy. At maximum brilliance a dwarf nova shines about as intensely as our sun, previously it had been only about a hundredth as bright. The number of outbursts ranges anywhere from 3 to 30 a year, but for any one star the intervals have a fairly constant value. Moreover, the maximum bright ness from outburst to outburst is the same within a factor of two for a given star. The dwarf novae are often referred to, after their prototypes, as U Geminornm or SS Cygni stars. (The stars of each constellation are designated by letters or numbers.) A subgroup of dwarf novae, called Z Camelopardalis stars, do not always descend to minimum bright ness between outbursts but may stay at some intermediate level for several months.

单选题The author made a few minor adjustments and then______.

单选题When Graham didn't come home from school, we were very worded about him. But fortunately he came to no ______.

单选题The conditions can be well imagined when one small settlement is expected to ______ 10,000 families. A. populate B. dwell C. house D. reside

单选题The sense of trust in an infant is under development when ______.

单选题To their great surprise, they found the floodwater had Udamaged/U the building's foundation.

单选题[此试题无题干]

单选题It is said that science has become too complex to {{U}}acknowledge{{/U}} the existence of universal truths.

单选题He brought an entirely new level of style and sophistication to jazz music. Although a gifted piano player, Duke Ellington used the orchestra as his principal instrument. He considered himself a composer and arranger rather than just a musician, like Jelly Roll Morton before him. It was in 1917 when Duke began playing music professionally in Washington, D. C. Stride piano players like James P. Johnson and Willie "The Lion" Smith influenced his piano technique. Duke led a band called The Washingtonians, which played at The Hollywood Club in Manhattan (the club was later renamed as the Kentucky Club). This band acquired a style all its own when trumpet player Bubber Miley joined it, bringing with him his unique plunger-mute style of playing. Called the "Jungle Sound," this sound came to be largely responsible for Ellington"s early success. A good example of this style of playing is the song East St. Louis Toodle-Oo. In 1924, the group recorded their first album, Choo Choo (Gotta Hurry Home and Rainy Nights (Rainy Days)). However, the band didn"t hit the big time until after Irving Mills became their manager and publisher in 1926. In 1927, the band rerecorded versions of East St. Louis Toodle-Oo, then debuted two songs that would be associated with Duke the for rest of his career, Black and Tan Fantasy and Creole Love Call. Ellington"s Orchestra, unlike many of its contemporaries, was able to make the transition from 1920s hot jazz of the to 1930s swing music. One song it played, It Don"t Mean a Thing (If It Ain"t Got That Swing), even came to define the era. What kept the Ellington Orchestra a major force in jazz was this very ability to adapt and grow with the times. The fame and influence of Ellington continued to grow throughout the 40s and 50s. His band continued to come up with jazz standards like Take the "A" Train, Perdido, the "C" Jam Blues, and Satin Doll. Duke wrote several religious pieces in the 1960s. He also composed The Far East Suite, then also collaborated with a highly diverse group of jazz musicians, among them Charles Mingus and Max Roach with whom he played a trio.

单选题Recent research into aging suggests that the body's defense mechanisms may lose the ability to distinguish what is alien.(2003年春季电子科技大学考博试题)

单选题Judging from the context, this passage is probably written ______.

单选题Of late, there have been several posts suggesting that America has no culture or that what culture it has is somehow inferior to that of other societies. Of course, it cannot be both. To suggest that America has, in some sense, an inferior culture is to grant that it has a culture. America most definitely has culture and the culture of America is easily the most dominant of the world. Whether it is McDonald's in the heart of what was once the center of the Evil Empire, or Arnold Schwarzenagger storming across German theatres, or Disneyland sending the French snobs into hysteria, American culture dominates Europe as never before. And it is not just Europe. Enter any shopping center in Asia and the odds are that the music blasting over the sound system is American pop music. Madonna look-alikes speak Mandarin Chinese. Often, American culture is derided by the so-called "intellectuals". (And by that, I do not mean the traditional definition of those who use their intellect to make a living as, in a increasingly service economy, there are few people today who would not fit into that category but, rather, people who fancy themselves as in some way gifted to impose their views upon the rest of us, to save us from ourselves.) What is it about American culture that annoys the "intellectuals" so much? It is precisely that which differentiates it from other cultures, particularly the cultures of Europe ("intellectuals" tending to be europhiles). Whereas European culture (and, indeed, most pre-industrial cultures) sprang from their traditions of aristocracy and the subservience of society to the ruling class, American culture serves the middle-class, the vulgar, if you will. Whereas European culture is concerned with what is exclusive and aloof, American culture is concerned with what is common and accessible. You don't need classes in school in rock music appreciation or the finer aspects of eating pizza. Some have suggested that America is doomed because it has no culture. But the contrary is more likely the case. In spite of the best efforts of the multi-cultural fascists, America has yet to fulfill its manifest destiny primarily because its culture is not only dominating and assimilating immigrants from every corner of the world, it is, indeed reaching out to every corner of the world and creating a world community, a community centered on the individual, every individual not just those gifted with expensive tastes.

单选题I found seated at the table opposite to mine another guest. He was a decently unsociable man, anxious to ______ alone.

单选题Writers learn as apprentices do except that they have no master to work for except themselves and the market. The fact is that writing is an empirical art, which can only be learned by doing it. This fact is no reflection on the art of writing. Because skill is acquired in a seemingly haphazard way it is none the worse, indeed sometimes the better, for it. As in every art you must have at least the foundation of a gift, without which it is useless to proceed; but if the foundation exists, then success—not merely economic— is largely a matter of persistence and of making the most of opportunities. Experience is a hard school. Wastage among aspiring writers is high and most survivors have to rely on another job. The pros and cons of that situation are debatable. Working out in the world is not solely a form of insurance; it can also be a vital source of material and incentive, particularly for the fiction writer. Many well-known authors labored away at other jobs for part or all of their lives, and either profited there from or made their names notwithstanding. Economic security frees the mind from worry, but a routine job also consumes mental energy which might otherwise be harnessed to creative output. This applies as much to freelance journalism and other ancillary activities of authorship as to nonliterary employment. A regular stint of reviewing, reading manuscripts for publishers, broadcasting, lecturing, and the like, may oil the machinery of the mind, but it may also use up horsepower to the point of exhaustion. Moreover, continuity of creation is often vital—whether for the construction of a work of fiction or for historical research or, indeed, for any idea that has to be digested into literary form. Interruptions nowadays, however, are a professional hazard that all authors have to contend with, but they are not insuperable and not the worst threat to a living literature.

单选题Such occupations were so ______ as to be unworthy of his full attention. A. triggering B. tripling C. trifling D. trembling

单选题It's often a mistake to ______ appearance; that poor-looking individual is anything but poor. In fact, he is a millionaire. A. go over B. go by C. go against D. go for