单选题Leaves are to a plant ______ lungs are to an animal.

单选题—Who has been planning the dance? —Everyone in the class ______. A. is B. has C. have D. are

单选题According to the passage, in the eighteenth and nineteenth centuries, some Americans ______.

单选题There are so many new books about dying that there are now special shelves set aside for them in bookshops, along with the health-diet and home-repair paperbacks. Some of them are so 21 with detailed information and step-by-step instructions for performing the function, that you'd think this was a new sort of 22 which all of us are now required to learn. The strongest impression the casual reader gets is that proper dying has become an extraordinary, 23 an exotic experience, something only the specially trained can do. 24 , you could be led to believe that we are the only 25 capable of being aware of death, and that when the rest of nature is experiencing the life cycle and dying, one generation after 26 , it is a different kind of process, done automatically and trivially, or more "natural", as we say. An elm in our backyard 27 the blight (枯萎病) this summer and dropped stone dead, leafless, almost overnight. One weekend 28 was a normal-looking elm, maybe a little bare in spots but 29 alarming, and the next weekend it was gone, passed over, departed, taken. Taken is right, for the tree surgeon came by yesterday with his 30 of young helpers and their cherry picker, and took it down branch by branch and carted it off in the back of a red truck, everyone 31 . The dying 32 a field mouse, at the jaws of an amiable household cat, is a spectacle I have beheld many times. It 33 to make me wince. However, early in life I gave up throwing sticks 34 the cat to make him drop the mouse, 35 the dropped mouse regularly went ahead and died anyway.

单选题Whenever possible, Ina ______how well she speaks Japanese.

单选题What do statistics do for science?

单选题They had to face up to innumerable ______ before they achieved their goal.(2006年中国矿业大学考博试题)

单选题According to the passage, the word "scoundrel" in Par

单选题There are two factors which determine an individual's intelligence. The first is the sort of brain he is born with. Human brains differ considerably, some being more capable than others. But no matter how good a brain he has to begin with, an individual will have a low order of intelligence unless he has opportunities to learn. So the second factor is what happens to the individual the sort of environment in which he is reared (抚养). If an individual is handicapped environmentally, it is likely that his brain will fail to develop and he will never attain the level of intelligence of which he is capable. The importance of environment in determining an individual's intelligence can be demonstrated by the case history of the identical twins, Peter and Mark. Being identical, the twins had identical brains at birth, and their growth processes were the same. When the twins were three months old, their parents died, and they were placed in separate foster (收养) homes. Peter was reared by parents of low intelligence in an isolated community with poor educational opportunities. Mark was reared in the home of well-to-do parents who had been to college. He was read to as a child, sent to good schools, and given every opportunity to be stimulated intellectually. This environmental difference continued until the twins were in their late teens, when they were given tests to measure their intelligence. Mark's IQ was 125, twenty-five points higher than the average and fully forty points higher than his identical brother. Given equal opportunities, the twins, having identical brains, would have tested at roughly the same level.

单选题They are meticulous in work, Well aware a careless mistake will cost the company millions of pounds.

单选题

单选题The sound from the wastebasket was made by ______.

单选题Eye contact is important because wrong contact may create a communication ______ A. barrier B. tragedy C. vacuum D. question

单选题Success, it is often said, has many fathers--and one of the many fathers of computing, that most successful of industries, was Charles Babbage, a 19th-century British mathematician. Exasperated by errors in the mathematical tables that were widely used as calculation aids at the time, Babbage dreamed of building a mechanical engine that could produce flawless tables automatically. But his attempts to make such a machine in the 1920s failed, and the significance of his work was only rediscovered this century. Next year, at last, the first set of printed tables should emerge from a calculating "difference engine" built to Babbage's design. Babbage will have been vindicated. But the realization of his dream will also underscore the extent to which he was a man born ahead of his time. The effort to prove that Babbage's designs were logically and practically sound began in 1985, when a team of researchers at the Science Museum in London set out to build a difference engine in time for the 200th anniversary of Babbage's birth in 1992. The team, led by the museum's curator of computing, Doron Swade, constructed a monstrous device of bronze, iron and steel. It was 11 feet long, seven feet tall, weighed three tons, cost around $500 000 and took a year to piece together. And it worked perfectly, cranking out successive values of seventh-order polynomial equations to :31 significant figures. But it was incomplete. To save money, an entire section of the machine, the printer, was omitted. To Babbage, the printer was a vital part of design. Even if the engine produced the correct answers, there was still the risk that a transcription or typesetting error would result in the finished mathematical tables being inaccurate. The only way to guarantee error-free tables was to automate the printing process as well. So his plans included specifications for a printer almost as complicated as the calculating engine itself, with adjustable margins, two separate fonts, and the ability to print in two, three or four columns. In January, after years of searching for a sponsor for the printer, the Science Museum announced that a backer had been found. Nathan Myhrvold, the chief technology officer at Microsoft, agreed to pay for its construction (which is expected to cost $373 000 with one Proviso: that the Science Museum team would build him an identical calculating engine and printer to decorate his new home on Lake Washington, near Seattle). Construction of the printer will begin--in full view of the public--at the Science Museum later this month. The full machine will be completed next year. It is a nice irony that Babbage's plans should be realized only thanks to an infusion of cash from a man who got rich in the computer revolution that Babbage helped to foment. More striking still, even using 20th-century manufacturing technology the engine will have cost over $830 000 to build. Allowing for inflation, this is roughly a third of what it might have cost to build in Babbage's day-in contrast to the cost of electronic-computer technology, which halves in price every 18 months. That suggests that, even had Babbage succeeded, a Victorian computer revolution based on mechanical technology would not necessarily have followed.

单选题______if I had arrived yesterday without letting you know beforehand?

单选题The earliest immigrants to North America found Indians already living there. The Indians numbered about 500,000 at that time. Their society was a primitive society, but they lived peacefully and welcomed the white strangers to the land. However, these early immigrants from Europe didn"t want to share the land with the natives. They killed off many of the Indians, seized their land or pushed them off to lands farther away. Today the Indians, not more than half a million, live in poverty and misery on the land on which they were once masters. The earliest immigrants were the Spanish, who settled in the southern part of what is now the US. The next large group were the English, after the English came the French, Dutch, Irish, Germans, and other nationality groups, mostly European. Another early group to arrive were the Negroes. But they were brought in as slaves from Africa. They didn"t win freedom till generations later.

单选题We have known for a long time that the organization of any particular society is influenced by the definition of the sexes and the distinction drawn between them. But we have realized only recently that the identity of each sex is not so easy to pin down, and that definitions evolve in accordance with different types of culture known to us, that is, scientific discoveries and ideological revolutions. Our nature is not considered as immutable, either socially or biologically. As we approach the beginning of the 21st century, the substantial progress made in biology and genetics is radically challenging the roles, responsibilities and specific characteristics attributed to each sex, and yet, scarcely twenty years ago, these were thought to be "beyond dispute". We can safely say, with a few minor exceptions, that the definition of the sexes and their respective functions remained unchanged in the West from the beginning of the 19th century to the 1960s. The role distinction, raised in some cases to the status of uncompromising dualism on a strongly hierarchical model, lasted throughout this period, appealing for its justification to nature, religion and customs alleged to have existed since the dawn of time. The woman bore children and took care of the home. The man set out to conquer the world and was responsible for the survival of his family, by satisfying their needs in peacetime and going to war when necessary. The entire world order rested on the divergence of the sexes. Any overlapping or confusion between the roles was seen as a threat to the time- honored order of things. It was felt to be against nature, a deviation from the norm. Sex roles were determined according to the "place" appropriate to each. Women's place was, first and foremost, in the home. The outside world, i. e. workshops, factories and business firms, belonged to men. This sex-based division of the world (private and public) gave rise to a strict dichotomy between the attitudes, which conferred on each its special identity. The woman, sequestered at home, "cared, nurtured and conserved". To do this, she had no need to be daring, ambitious, tough or competitive. The man, on the other hand, competing with his fellow men, was caught up every day in the struggle for survival, and hence developed those characteristics which were thought natural in a man. Today, many women go out to work, and their reasons for doing so have changed considerably. Besides the traditional financial incentives, we find ambition and personal fulfillment motivating those in the most favorable circumstances, and the wish to have a social life and to get out of their domestic isolation influencing others. Above all, for all women, work is invariably connected with the desire for independence.

单选题Americans eat ______as they actually need every day.