单选题 It sounds like a science fiction, but researchers say it's a scientific fact: Microscopic organisms dubbed "killer algae" are paralyzing fish with unknown toxins and then eating away at their flesh. {{U}}They{{/U}} might be making people sick, too. The name given to this single-cell organism, or dinoflagellate, is Pfiesteria piscimorte—{{U}}literally{{/U}}, "fish killer." It was discovered at North Carolina State University in 1988, but at the same time, few scientists believed in its existence, much less in its highly unusual predatory nature. But ongoing research has led to international acknowledgment of the phenomenon and, recently, research funding. Seemingly {{U}}prompted{{/U}} by an unknown substance secreted by fish, the aggressive creature swims into action. It sends neurotoxins into the water and air, paralyzing a fish's nervous system, and causing it to gasp for air at the surface. Eventually the fish suffocates. The killer dinoflagellate then attaches itself to the fish and begins sucking away at its flesh. This macabre scenario may help solve several sea mysteries, such as why fishermen report seeing "fish walks" (fish trying to leave the water) and pools of dead fish with holes eaten through them. Whether humans are affected by the dinoflagellate's toxin remains to be seen. Researchers think it's unlikely eating fresh fish are in danger, but anyone with frequent exposure to the creature could be in peril. Several researchers working with the algae have reported bouts of memory loss and disorientation. To understand the killer algae further, scientists must fully characterize their toxin and determine what stimulates them to attack. They also need to know if the algae are hurting fish populations, and whether pollutants make them more likely to attack.

单选题Banks shall be unable to ______, or claim relief against the first 15% of any loan or bankrupted debt left with them． A．write off B．put aside C．shrink from D．come over

单选题In many countries tobacco and medicine are government ______.

单选题It is a market which sales value might be more than 10 billion yuan.

单选题Even after he had been named as the most valuable employee, he could not screw up his courage to ask his boss for a raise.

单选题Your usual teacher has lost his voice and______I am taking his place today. A. nevertheless B. however C. moreover D. accordingly

单选题Obviously these are all factors affecting smooth operation, but the underlying problem is still to be identified.

单选题A new technological process may be employed to tap this abundant supply directly. A. produce B. reserve C. exploit D. search

单选题 Despite Denmark's manifest virtues, Danes never talk about how proud they are to be Danes. When Danes talk to foreigners about Denmark, they always begin by commenting on its tininess, its unimportance, the difficulty of its language, the general small-mindedness and self-indulgence of their countrymen and the high taxes. It is the land of the silk safety net, where almost half the national budget goes toward smoothing out life's inequalities, and there is plenty of money for schools, day care, retraining programs, job seminars—Danes love seminars: three days at a study centre heating about waste management is almost as good as a ski trip. It is a culture bombarded by English, in advertising, pop music, the Internet, and despite all the English that Danish absorbs—there is no Danish Academy to defend against it. It is the land where a foreigner is struck by the sweet egalitarianism that prevails. It's a nation of recyclers—about 55 percent of Danish garbage gets made into something new—and no nuclear power plants. It's a nation where things operate well in general. A brochure from the Ministry of Business and Industry says, "Denmark is one of the world's cleanest and most organized countries, with virtually no pollution, crime, or poverty. Denmark is the most corruption-free society in the Northern Hemisphere." So, of course, one's heart lifts at any sighting of Danish sleazo: skinhead graffiti on buildings ("Foreigners Out of Denmark!"), broken beer bottles in the gutters, dmnken teenagers slumped in the park. Nonetheless, it is an orderly land. However, Danes don't think of themselves as a waiting-at-2-a, m.-for-the-green-light people. Danes see themselves as jazzy people, improvisers, more free spirited than Swedes, but the troth is that Danes are very much like Germans and Swedes. Orderliness is a main {{U}}selling point{{/U}}. Denmark has few natural resources and limited manufacturing capability; its future in Europe will be as a broker, banker, and distributor of goods. You send your goods by container ship to Copenhagen, and these bright, young, English-speaking, utterly honest, highly disciplined people will get your goods around to Scandinavia, the Baltic States and Russia. Airports, seaports, highways and rail lines are ultramodern and well-maintained. The orderliness of the society doesn't mean that Danish lives are less messy or lonely than yours or mine, and no Dane would tell you so. But there is a sense of entitlement and security that Danes grow up with. Certain things are yours by virtue of citizenship, and you shouldn't feel bad for taking what you're entitled to, you're as good as anyone else. The rules of the welfare system are clear to everyone, the benefits you get if you lose your job,the steps you take to get a new one; and the orderliness of the system makes it possible for the country to weather high unemployment and social unrest without a sense of crisis.

单选题To study English well, he habituated himself to talking with foreigners.

单选题The reporter compares a husband to a particularly tricky musical instrument, one that a wife must learn to play ______ her advantage.

单选题 At the beginning of the twentieth century, North American society held, as an ideal, the Nuclear Family. This presumably perfect residential, social, and economic unit consisted of an adult male, an adult female and their minor children. This structure was thought to be stable and long lasting. However, a few decades later, the structure of that ideal family was being altered radically even while it was being touted as the structure to be aimed for. Popular magazines bemoaned the loss of the Nuclear Family and its replacement with inferior forms. There are a number of factors that are acting in concert to apply pressure on the Nuclear Family and generate a variety of new structures. Some of these are: The definition of marriage has changed somewhat in that few people now consider it to last "until death do us part." The concept of monogamy (the marriage of one man and one woman) has been modified to a form now referred to as serial monogamy (the marriage of one man and one woman at a time). This reflects the increasing equality of women and men in terms of economic advantage and the recognition that many women no longer depend on men for their survival. Women are acquiring independence and have become empowered to make their own choices. With this independence, the need to form a relationship with a man becomes less important. This change embodies the concept that the marriage is temporary and can be terminated by either partner at any time. Associated with this, of course, is the relaxation of the divorce laws and the significant reduction of the shame that had one time been attached to divorce. The economy of North America has resulted in a two-tier system of a few rich who control most of the resources and a large portion of the population who control almost none of the resources. Because of this, many couples are forced to have both partners with full-time jobs outside the home. There are unintended byproducts of the need for a double income. The most important of these is the replacement of a mother-oriented socialization of children to a "stranger-oriented" socialization system reflected in the growth of the childcare industry. Also, either partner is financially able to end the marriage without significant hardship. The combination of these changes will in the coming decades have a profound effect on the structure of the family of North America. As a result, the family will be a fluid, constantly changing structure with variable household arrangements as the norm.

单选题Justices of the peace have jurisdiction over the trials of some civil suits and of criminal cases involving minor offenses.

单选题With all its advantages, the computer is by no means without its ______. A. boundaries B. restraints C. confinements D. limitations

单选题While he was in the office he ______ doing something to doing nothing. A. preferred B. liked C. favored D. approved

单选题He murmured a few words of complaint and went out the room quite irritated. A. numerated B. fragmented C. mumbled D. hostiled

单选题Historically, a cornerstone of classical empiricism has been the notion that every true ______ must be confirmable by specific observations.

单选题Fashion is partly a search for new language to discredit the old, a way in which each generation can ______ its immediate predecessor and distinguish itself.

单选题Experiments have shown that 160 decibels of noise are {{U}}lethal{{/U}} for small fur-bearing animals.

单选题Asia's first democracy — a country that has a freely elected government — was ______ which became self-governing in 1935.