单选题Something worth doing is none______for being done twice,

单选题A careful {{U}}screening{{/U}} of the disease will lessen the patients' anxiety. A. showing B. hiding C. investigation D. projection

单选题Many people came to donate blood {{U}}of their own accord{{/U}}. A. willingly B. for their own sake C. of their own D. without the help of others

单选题Obama's high-profile failure to win the Olympics for Chicago could feed negative {{U}}narratives{{/U}} nipping at his heels. A. attitudes B. accounts C. impacts D. responses

单选题Fearful of losing her job for good, this lady decided to talk to the manager directly. A. for benefits B. by luck C. for ever D. at hand

单选题Humans have to settle the problems with food, clothes and______before they can survive. A．cabin B．mansion C．shed D．shelter

单选题The manager is seeking some cost-effective methods that can call forth their initiative. A. efficient B. conventional C. economical D. unique

单选题Auto makers should never ______ the quality of products amid fierce competition. A. bring into play B. make sense of C. lose sight of D. end up with

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单选题In the wake of such findings, several states are rethinking their plan to open these camps.

单选题Passage One New York's WCBS puts it in a way that just can't be better expressed: "It was an accident waiting to happen." 15-year-old Alexa Longueira was wandering along the street in Staten Island, obliviously tapping text messages into her phone as she walked. Distracted by her phone, she failed to notice the open manhole (下水道窨井) in her path, and plunged into it, taking an unprepared bath of raw sewage along with receiving moderate injuries. Longueira called the dive "really gross, shocking and scary." It's not all Longueira's fault. The manhole shouldn't have been left uncovered and unattended, and no warning signs or hazard cones had been set up near the work site. A worker with New York's Department of Environmental Protection (DEP), who was preparing to flush the sewage, helped her out, and the department later issued a formal apology for the incident. Nonetheless, observers are harshly divided over who is to blame here. The DEP is certainly at fault for failing to secure the manhole, but to what extent should the girl be held accountable for failure to be aware of her surroundings? If she had stepped into traffic and been hit by a car, would her reaction (that is: anger and a potential lawsuit) be any different? Detachment from one's environment due to electronic gadgets is a growing problem--and a hazardous one. The government is even trying to get involved, with multiple laws on the books across the country outlawing cell phone use and text messaging while operating a motor vehicle in the wake of serious accidents involving distracted drivers. New York Senator Kruger even tried to criminalize the use of handheld devices (including phones, music players, and game players) by pedestrians while they are crossing streets in major New York cities, due to concerns over the number of auto vs. pedestrian accidents. Following a substantial outcry, that legislation appears never to have been formally introduced. But did Kruger have a point? What interested me, at least, is the end of the stow above that Longueira lost a shoe in the sewage. But since other things are not reported as lost, I'm guessing she appears to have managed to keep her grip on her phone during the accident.

单选题Artists should cultivate their own ______ style rather than always imitating others. A. single B. individual C. private D. separate

单选题Obsessed with their research on superconductive material, they were oblivious of the goings-on around them.

单选题When he was young, he was afflicted with paralysis.

单选题You are not supposed to {{U}}take advantage of{{/U}} such a little girl by making her work for 50 cents an hour. A. exploit B. export C. expose D. exchange

单选题______ the lives they stole, our enemies failed to stop us from achieving a single one of our strategic objectives in Iraq. A. But for B. For all C. As for D. What for

单选题Blue collar and government jobs are among the most 1 careers for U.S. graduates, according to U.S. News magazine"s 2008 Best Careers report. U.S. employers are increasingly offshoring professional jobs. This means less jobs 2 college-graduate skills, the magazine says. As in many other countries, U.S. high school students are told that college is the 3 . So there"s a growing 4 of skilled people in jobs that don"t require a college education. But the report also says that some rewarding blue-collar careers, such as technical work in the biomedical equipment and security systems sectors, are more 5 to college graduates. These are more knowledge-based than the usual blue-collar jobs. Government is becoming an employer of 6 . Corporations, fueled by pressures to compete globally, continue to get ever 7 . Non-profit organizations are increasingly strapped for cash. Government is able to pay employees well, 8 their practices are economically sound, the magazine says. The report also indicates that social 9 may be the enemy of contentment in career. People are flocking in greater numbers to careers in the law, medicine and architecture. Yet recent surveys of job satisfaction in those professions 10 a less-than-rosy picture.

单选题 Plants are subject to attach and infection by a remarkable variety of symbiotically species and have evolved a diverse array of mechanisms designed to frustrate the potential colonists. These can be divided into preformed or passive defense mechanisms and inducible or active systems. Passive plant defense comprises physical and chemical barriers that prevent entry of pathogens(病原体), such as bacteria, or render tissues unpalatable or toxic to the invader. The external surfaces of plants, in addition to being covered by an epidermis(表皮层) and a waxy cuticle, often carry spiky hairs known as trichomes(毛状物), which either prevent feeding by insects or may even puncture and kill insect larvae. Other trichomes are sticky and glandular and effectively trap and immobilize insects. If the physical barriers of the plant are breached, then preformed chemicals may inhibit or kill the intrude, and plant tissues contain a diverse array of toxic or potentially toxic substances, such as resins, tannins, glycosides, and alkaloids, many of which are highly effective deterrents to insects that feed on plants. The success of the Colorado beetle in infesting potatoes, for example, seems to be correlated with its high tolerance to alkaloids that normally repel potential pests. Other possible chemical defenses, while not directly toxic to the parasite, may inhibit some essential step in the establishment of a parasitic relationship. For example, glycoproteins(糖蛋白) in plant cell walls may inactivate enzymes that degrade cell walls. These enzymes are often produced by bacteria and fungi. Active plant defense mechanisms are comparable to the immune system of vertebrate animals, although the cellular and molecular bases are fundamentally different. Both, however, are triggered in reaction to intrusion, implying that the host has some means of recognizing the presence of a foreign organism. The most dramatic example of an inducible plant defense reaction is the hypersensitive response. In the hypersensitive response, cells undergo rapid necrosis—that is, they become diseased and die—after being penetrated by a parasite; the parasite itself subsequently ceases to grow and is therefore restricted to one or a few cells around the entry site. Several theories have been put forward to explain the basis of hypersensitive resistance.

单选题The tower of the World Trade Center ______ after it was hit by the plane. A．dissipated B．paddled C．hedged D．conapsed

单选题It was already dark ______ I got up from my seat and prepared to leave my office. A. by the time B. since the time C. until the time D. during the time