单选题It took us only a few hours to______the paper off all four walls.

单选题In general, the health of older people is superior to______of previous generations.

单选题Government inspectors came to ______ Sam's meat-packing company.

单选题It is A(estimated) that a scientific principle has B(a life expectancy) of approximately C(a decade) before D(it drastically) revised or replaced by newer information.

单选题The purpose of the advertisement is ______.

单选题If you are a fan of science fiction, you've no doubt encountered the term nanotechnology. Yet over the past year also, a series of breakthroughs have transformed nanotech from sci-fi fantasy into a real world. Applied science, in the process, inspired huge investments by business, academia, and government. In industries as diverse as health care, computers, chemicals, and aerospace, nanotech is overhauling production techniques, resulting in new and improved products, some of which may already be in your home or workplace. The inspiration for nanotech goes back to a 1959 speech by the late physicist Richard Feynman, then a professor at the California Institute of Technology, titled "There's Plenty of Room at the Bottom. " Four decades later, Chad Mirkin, a Chemistry professor at Northwestern University's $ 34 million nanotech center, used a nanoscale device to etch most of Feynman's speech onto a surface the size of about 10 tobacco smoke particles. What accounts for the sudden acceleration of nanotechnology? A key breakthrough came in 1990, when researchers at IBM's Almaden Research Center succeeded in rearranging individual atoms at will. Using a device known as a scanning probe microscope, the warn slowly moved 35 atoms to spell the three-letter IBM logo, thus proving Feynman right. The entire Logo was less than three nanometers. Soon, scientists were not only manipulating individual atoms but "spray painting" with them as well. Using a tool known as a molecular beam epitary, scientists have learned to create ultra fine films of specialized crystals, built up one molecular layer at a time. This is the technology used today to build read-head components for computer hard drives. The next stage in the development of nanotechnology borrows a page from noture. Building a supercomputer no bigger than a speck of dust might seem an impossible task, until one realizes that evolution solved such problems more than a billion years ago. Living cells contain all sorts of anisole motors made of proteins that perform myriad mechanical and chemical functions, from muscle contraction to photosynthesis. In some instances, such motors may be re-engineered, or imitated, to produce products and processes useful to humans. How are these biologically inspired machines constructed? Often, they construct themselves, manifesting a phenomenon of nature known as self assembly. The macromolecules of such biological machines have exactly the right shape and chemical binding preferences to ensure that when they combine they will snap together in predesigned ways. For example, the two strands that make up DNA's double helix match each other exactly, which means that if they are separated in a complex chemical mixture, they are still able to find each other easily.

单选题I had no ______ of who I was or what I was going to be. A. mind B. idea C. think D. thought

单选题The church of La Placita, "the little square", formally called Nuestra Se ora Reina de Los Angeles, was founded under Spanish rule at around the same time as the pueblo bearing the same name, the future Los Angeles. Catholicism and Hispanic culture seemed inseparable there. They still largely are. Virtually all Father Estrada's parishioners are Hispanic, most of them of Mexican extraction. When Guatemalan and Salvadorean refugees showed up in the 1980s, it was natural for them, as good Catholics, to find sanctuary at La Placita, where they slept on the pews and Father Estrada gave them food. It was natural again in 2006, when the country went on an anti-immigrant binge, for many of the Latino counter-marches to start from La Placita. Latinos still come from all over southern California for baptisms and prayer, social services and a sense of community. But more and more grandmothers also come to Father Estrada with worries about children or grandchildren who have become hermanos separados, separated brothers, after defecting to an evangelical church, usually one with a Pentecostal flavour. The converts may have followed one of the evangelicals who come to La Placita to recruit, or friends whom they met at a spiritual rock concert or picnic. "I don't worry, but I find it to be challenging," says Father Estrada. Some 68% of Hispanics in America are still Catholic, according to the Pew Research Centre, a think-tank, and their absolute number, thanks to immigration and higher birth rates, continues to increase. But about 15% are now born-again evangelicals, who are fast gaining "market share", as Gaston Espinosa, a professor of religion at Claremont McKenna College, puts it. He estimates that about 3.9m Latino Catholics have converted, and that "for everyone who comes back to the Catholic Church, four leave it. " The main reason, he thinks, is ethnic identity. Evangelical services are not only in Spanish, as many Catholic sermons are nowadays, but are performed by Latinos rather than Irish or Polish-American priests, with the cadences, rhythms, innuendos and flow familiar from the mother country. The evangelical services tend to be livelier than Catholic liturgy and to last longer, often turning into an outing lasting the whole day. Women play greater roles, and there are fewer parishioners for each pastor than in the Catholic Church. The evangelical churches are also more "experiential", says Samuel Rodriguez, a third- generation Puerto Rican Pentecostal pastor and the president of the National Hispanic Christian Leadership Conference, an evangelical association. In the Catholic Church, a believer's relationship with Jesus is mediated through hierarchies and bureaucracies, he says, whereas the evangelical churches provide direct access to Jesus. The Pentecostals go one step further, with the "gifts of the Holy Spirit" (1 Corinthians) letting believers speak in tongues and pray for divine healing. "This is the first group in America to reconcile both the vertical and the horizontal parts of the cross," says Mr. Rodriguez. By this he means that the Latino evangelical churches emphasise not only " covenant, faith and righteousness" (the vertical part), as white evangelicals do, but also " community, public policy and social justice" (the horizontal part), as many black evangelicals, but fewer white ones, do. To Latino evangelicals it is all one thing, he says, and the social outreach the church provides goes far beyond any government programme, with pastors snatching young men away from gang life and fighting to uphold the rights of immigrants. This also means that Latino evangelicals as a political force are distinct from white evangelicals. Many of the whites have veered hard right, hating abortion and gay marriage and reliably voting Republican, though less so very recently. Latinos tend to be even more pro-life and traditional marriage than whites, says Mr. Rodriguez, but only because they know that "mom and dad in the home is the prime antidote to gangs and drugs. " That same pragmatism makes them believe in government services and the taxes that pay for them, and of course in immigrant rights. As voters, he reckons, Latino evangelicals are therefore the quintessential independents, up for grabs by either party. But it may be American Catholicism that changes the most. About a third of American Catholics are Latino now, and their share is growing. They are also different Catholics, with more than half describing themselves as " charismatics ", according to the Pew report. Charismatics remain in their traditional denomination, but believe in some aspects of Pentecostalism, such as the gifts of the Holy Spirit, especially the speaking in tongues. Latino charismatics see themselves as a renewal movement within Catholicism, as it converges with other churches. And in general all churchgoing Latinos tend to see themselves as renewing Christianity in America. That makes them a powerful force as demographic changes turn America ever more Hispanic, and increasingly different from secular Europe.

单选题Marry has come; I will put______plate on the dining table.

单选题The scientists have come to the conclusion, based on the signals and photographs sent back by the satellite, ______there is no life on Venus.

单选题While still in its early stages, welfare reform has already been judged a great success in many states—at least in getting people off welfare. It"s estimated that more than two million people have left the rolls since 1994. In the past four years, welfare rolls in Athens County have been cut in half. But 70 percent of the people who left in the past two years took jobs that paid less than $ 6 an hour. The result： The Athens County poverty rate still remains at more than 30 percent— twice the national average. For advocates (代言人) for the poor, that"s an indication that much more needs to be done. "More people are getting jobs, but it"s not making their lives any better," says Kathy Lairn, a policy analyst at the Center on Budget and Policy Priorities in Washington. A center analysis of U.S. Census data nationwide found that between 1995 and 1996, a greater percentage of single, female-headed households were earning money on their own, but that average income for these households actually went down. But for many, the fact that poor people are able to support themselves almost as well without government aid as they did with it is in itself a huge victory. "Welfare was a poison. It was a toxin (毒素) that was poisoning the family," says Robert Rector, a welfare-reform policy analyst. "The reform is changing the moral climate in low-income communities. It"s beginning to rebuild the work ethic (工作道德), which is much more important. " Mr. Rector and others argued that once "the habit of dependency is cracked," then the country can make other policy changes aimed at improving living standards. (286 words)

单选题It would be more effective to persuade the teenager smokers to give up smoking if ______.

单选题The country has ______ people and ______ money ______ spent on tobacco every year. A. a large quantity of, a number of, are B. plenty of, a great deal, are C. a great deal of, plenty of, is D. a large number of, a large amount of, is

单选题Although most dreams apparently happen ______, dream activity may be provoked by external influences. A. spontaneously B. simultaneously C. homogeneously D. instantaneously

单选题What things in life aye you most desirous ______ attaining? A. to B. for C. with D. of

单选题They provide a means of keeping ______ of the thousands of journal papers that are published monthly or quarterly.

单选题It has been a wretched few weeks for America's. celebrity bosses. AIG's Maurice Greenberg has been dramatically ousted from the firm through which he dominated global insurance for decades. At Morgan Stanley a mutiny is forcing Philip Purcell, a boss used to getting his own way, into an increasingly desperate campaign to save his skin. At Boeing, Harry Stonecipher was called out of retirement to lead the scandal-hit firm and raise ethical standards, only to commit a lapse of his own, being sacked for sending e-mails to a lover who was also an employee. Carly Fiorina was the most powerful woman in corporate America until a few weeks ago, when Hewlett-Packard (HP) sacked her for poor performance. The fate of Bernie Ebbers is much grimmer. The once high-profile boss of WorldCom could well spend the rest of his life behind bars following his conviction last month on fraud charges. In different ways, each of these examples appears to point to the same welcome conclusion: that the imbalance in corporate power of the late 1990s, when many bosses were allowed to behave like absolute monarchs, has been corrected. Alas, appearances can be deceptive. While each of these recent tales of chief-executive woo is a sis of progress, none provides much evidence that the crisis in American corporate governance is yet over. In fact, each of these cases is an example of failed, not successful, governance. At the very least, the beards of both Morgan Stanley and HP were far too slow to address their bosses' inadequacies. The record of the Boeing beard in picking chiefs prone to ethical lapses is too long to be dismissed as mere bad luck. The fall of Messrs Greenberg and Ebbers, meanwhile, highlights the growing role of government-and in particular, of criminal prosecutors in holding bosses to account: a development that is, at best, a mixed blessing. The Sarbanes-Oxley act, passed in haste following the Enron and WorldCom scandals, is imposing heavy costs on American companies; whether these are exceeded by any benefits is the subject of fierce debate and may not be known for years. Eliot Spitzer, New York's attorney-general, is the leading advocate and practitioner of an energetic "law enforcement" approach. He may be right that the recent burst of punitive actions has been good for the economy, even if some of his own decisions have been open to question. Where he is undoubtedly right is in arguing that corporate America has done a lamentable job of governing itself. As he says in an article in the Wall Street Journal this week: "The hour cede among CEOs didn't work. Board oversight didn't work. Ser-regulation was a complete failure." AIG's board, for example, did nothing about Mr Greenberg's use of murky accounting, or the conflicts posed by his use of offshore vehicles, or his constant bullying of his critics let alone the firm's alleged participation in bid-rigging--until Mr Spitzer threatened a criminal prosecution that might have destroyed the firm.