单选题What does the word "invitro" underlined in Paragraph 2 most probably mean?

单选题Amateur cooks have joined the craze with the help of more than 20 cookbooks which devote exclusively with hot and spicy Mexican, Thai and Cajun foods.

单选题Most people would be impressed by the high quality of medicine available to most Americans. There is a lot of specialization , a great deal of attention to the individual, a vast amount of advanced technical equipment, and intense effort not to make mistakes because of the financial risk which doctors and hospitals must face in the courts if they handle things badly. But the Americans are in a mess . The problem is the way in which health care is organized and financed. Contrary to public belief, it is not just a free competition system. To the private system has been joined a large public system, because private care was simply not looking after the less fortunate and the elderly. But even with this huge public part of the system, which this year will eat up 84.5 billion dollars—more than 10 percent of the U.S. budget—large numbers of Americans are left out . These include about half the 11 million unemployed and those who fail to meet the strict limits on income fixed by a government trying to make savings where it can. The basic problem, however, is that there is no central control over the health system. There is no limit to what doctors and hospitals charge for their services, other than what the public is able to pay. The number of doctors has shot up and prices have climbed. When faced with toothache, a sick child, or a heart attack, all the unfortunate person concerned can do is pay up. Two-thirds of the population are covered by medical insurance. Doctors charge as much as they want knowing that the insurance company will pay the bill. The medical profession has as a result become America"s new big businessmen. The average income of doctors has now reached $100,000 a year. With such vast incomes the talk in the doctor"s surgery is as likely to be about the doctor"s latest financial deal, as about whether the minor operation he is recommending at, several thousand dollars is entirely necessary. The rising cost of medicine in the U. S. A. is among the most worrying problem facing the country. In 1981 the country"s health cost climbed 15.9 percent—about twice as fast as prices in general.

单选题If you left your book on the table overnight, you would find the following morning that it was still exactly when you had left it, provided nobody had moved it. If a ball is made to roll on a very smooth surface, it will roll a long distance unless something stops it or changes its direction. This tendency of an object to remain at rest unless something moves it and to continue moving unless something stops it is known as the Law of Inertia. The following examples show the truth of this law.(a) Put a table-cloth on a table and arrange a pile of books on it. Hold one edge of the tablecloth and pull it quickly. The table-cloth will come off, leaving the pile of books undisturbed.(b) Place a small piece of cardboard on an open jar and place a coin on it directly over its mouth. Use one finger to flick the piece of cardboard away. You will notice that the coin drops into the jar.(c) Sitting in a car which starts suddenly, you feel you are jerked backwards. In fact, you are not jerked backwards. Your lower half, which is in contact with the cushion, is forced to move forward with the car, and the upper part of your body, which remained at rest, is left behind.

单选题In this passage, a quack or a charlatan is someone who ______.

单选题America"s New Patriotism Patriotism has always been the most abstract of American virtues—which may be why Americans fight so ferociously over the symbols that help define it. Too often those symbols—flags, anthems, slogans—which are meant to unite Americans, end up dividing them. To many people, the meaning of patriotism is simple: love of country. But love of a country that is dedicated to a proposition, not a king or a religion—a nation that is based on ideas, not blood—has always created a different kind of citizen. America"s patriotism expresses itself most truly in actions, not words. Its patriotism shapes its people"s responsibilities as citizens, how they navigate in the world and, ultimately, what it means to be an American. There is nothing more important that those ideals, and Americans are in the midst of a historic presidential race that will help redefine them for the 21st century. There have always been twin strains of patriotism in U. S. history, two different definitions of American exceptionalism: a sense that the country"s greatness is based on its provenance and what its people have achieved, and a belief that the greatness of America lies in its promise and how it attempts to live up to its ideals. Conservatives and liberals have been arguing about these two strains for years, and that debate has become the pivot of U. S. politics. Republicans have contended that they are the true legatees of the nation"s heritage and attack Democrats for being ashamed of America. Democrats in turn depict Republicans as chest-thumping nationalists who prevent America from living up to its ideals. Both of these are caricatures. In Barack Obama, the first African-American presidential nominee, the mixed-race child of a single mother, the U. S. has a candidate whose perspective on—and experience of—America are different from those of any other nominee in history. In John McCain, Americans have the son and grandson of admirals who suffered grievously for his country and has spent his life as a public servant. To say that one of these represents the American Dream and the other does not is to set up a false choice. As they show in their own words on the following pages, both men embody the great traditions of American patriotism. What the U.S. needs going forward is third-way patriotism, a new patriotism that blends the faith of its fathers with, as Abraham Lincoln said, the unfinished work remaining before the nation. That new patriotism, as Eric Liu and Nick Hanauer write in The True Patriot, means "appreciating not only what is great about our country but also what it takes to create and sustain greatness." That formulation is what this campaign should be about: defining America"s course in the 21st century. The candidates may have different views on what makes Americans proud to be Americans, but they share a belief in a modem American exceptionalism: that America has a greatness of purpose no other nation possesses, and that for all its achievements, its greatest tasks remain before its people. ( Time , July 14, 2008)

单选题Like David Brent, Bartnall's boss once harbored ______ to be something in the music industry. A. inspirations B. aspirations C. restorations D. perspirations

单选题Often the roots of the plants harbor ants, which help build up the soil by their wastes and dead bodies.

单选题An epigram is usually defined being a bright or witty thought that is tersely and ingeniously expressed.

单选题Every group has a culture, however uncivilized it may seem to us. To the professional anthropologist, there is no intrinsic superiority of one culture over another, just as to the professional linguist, there is no intrinsic hierarchy among languages. People once thought of the languages of backward groups as undeveloped. While it is possible that language in general began as a series of grunts and groans, it is a fact established by the study of "backward" languages that no spoken tongue answers that description today. Most languages of uncivilized groups are, by our most severe standards, extremely complex．They differ from Western languages not in their sound patterns or grammatical struetures, which usually are fully adequate for all language needs, but only in their vocabularies, which reflect the objects and activities known to their speakers. Even in this aspect, two things are to be noted．First, all languages seem to possess the machinery for vocabulary expansion, either by putting together words already in existence or by borrowing them from other languages and adapting them to their own system. Second, the objects and activities requiting names and distinctions in "backward" languages, while different from the West, are often surprisingly numerous and complicated. A Western language distinguishes merely between two degrees of remoteness ("this" and "that"). But some languages of the American Indians distinguish between what is close to the speaker, or to the person addressed, or removed from both, or out of sight, or in the past, or in the future.

单选题I ______ you that the goods will be delivered next week.

单选题"We're not bringing in millions of dollars," says a director of development. "But we want to make sure the demand is there before we act {{U}}to{{/U}} the project."

单选题The general manager demanded the job will be completed before the Spring Festival holidays.

单选题The chairman of the board ______ on me the unpleasant job of dismissing good workers the firm can no longer afford to employ. A. compelled B. posed C. pressed D. tempted

单选题The company's training plan was designed to help the employees to improve their work habits and ______. A. proficiency B. sufficiency C. insufficiency D. efficiency

单选题It is understandable that though adolescent maturational and developmental states occur in an orderly sequence, their timing ______ with regard to onset and duration.

单选题Human beings are superior to animals {{U}}that{{/U}} they can use language as a tool of communication.

单选题Many of the electric and electronic products we purchase and consume today are what some industrial experts call "{{U}}homogeneous{{/U}} toys".

单选题George Ernest Morrison, an Australian, traveled the "five-foot roads," or foot paths, from Shanghai to Rangoon in 1894, ______ China before it was engulfed in a century of revolution, war and political tumult.

单选题Some children display an unacceptable curiosity about every new thing they encounter. A．incredible B．infectious C．incompatible D．inaccessible