题目内容
"What’s done cannot be undone," moaned Lady Macbeth in her famous sleepwalking scene. If she woke up in the 21st century, she would be pleased to discover that whatever can be done can be undone, too. Or perhaps it just seems that way in the new social spaces we are carving for ourselves online. On popular web sites devoted to social networking, innovative verbs have been springing up to describe equally innovative forms of interactions: you can friend someone on Facebook; follow a fellow user on Twitter; or favorite a video on YouTube. Change your mind You can just as easily unfriend, unfollow or unfavorite with a click of the mouse. The recent un-trend has also seeped into the world of advertising. KFC is marketing its new Kentucky Grilled Chicken with the tagline "UNthink: Taste the UNfried Side of KFC." The cellphone company MetroPCS challenges you to "Unlimit Yourself," while its competitor Boost Mobile wants you to get "UNoverage’D" and "UNcontract’D" (ridding yourself of burdensome overage fees and contracts). Even victims of the financial downturn can seek solace in un-: ABC broadcast a special report in May telling viewers how to get "Un-Broke." Where did all of this un- activity come from Ever since Old English, the un- prefix has come in two basic flavors. It can be used like the word "not" to negate adjectives (unkind, uncertain, unfair) and the occasional noun (unreason, unrest, unemployment). Or it can attach to a verb to indicate the reversal of an action (unbend, unfasten, unmask). Both kinds of un-are ripe for creating new words. The negative variety of the prefix has been particularly fertile for spinning off nouns, at least since 7-Up first branded itself as the "Un-Cola" in the late 1960s. In the business world we now find unconferences and unmarketing, predicated on the notion that we need to rethink traditional models of conferences and marketing. And beware of unnovation, the opposite of innovation. But it’s the reversible un- that has really been getting a workout lately, even more so than its semantic sibling de- (as in declutter or defragment). Our expectations that any action can be taken back have been primed by a few decades of personal computing, which injected the founding metaphor of "undoing" into the common consciousness. An early glimmer of our Age of Undoing appeared in a prescient 1976 research report by LanceA. Miller and JohnC. Thomas ofI.B.M., drably titled "Behavioral Issues in the Use of Interactive Systems." "It would be quite useful," Miller and Thomas observe, "to permit users to ’take back’ at least the immediately preceding command (by issuing some special ’undo’ command)." Useful indeed! The undo command would become a crucial feature of text editors and word processors in the PC era, assigned the now-familiar keyboard shortcut of Control-Z by programmers at the research center Xerox PARC. In the software of the 80’s, some undo commands became "multilevel," allowing users to take back a whole series of actions (called the undo stack), not just the most recent one. Ad-hoc un- verbs began to emerge for these reversible innovations. In 1984, the software company New Star introduced the unerase command for its word-processing program NewWord, whileI.B.M.’s VisiWord countered with undelete. From there it was a quick step to unbolding, unitalicizing and even un-underlining your errantly formatted text. The Yale University linguist Laurence R. Horn sees an earlier technological metaphor at work in the flurry of un- verbs. As Horn writes in "Uncovering the Un-Word," a paper in the journal Sophia Linguistica: "The prevailing sense is that for something to unhappen, the tape of reality must be set to Rewind. That this is a practical impossibility . . . does not make the metaphor any the less attractive." Rewinding the tape of reality is an appealing metaphor in science fiction, unsurprisingly. Nancy Etchemendy’s young-adult novel, "The Power of Un," features a middle-school student who operates a gizmo called "The Unner" to go back in time and undo past events. Songwriters have also made poetic use of the un- prefix to imagine the reversal of irreversible things, notably falling in and out of love. It’s a useful lyrical trick in such genres as folk rock (Lucinda Williams’s "Unsuffer Me"), R & B (Toni Braxton’s "Un- Break My Heart") and country (Lynn Anderson’s "How Can I Unlove You"). But as Horn points out, imaginary unloving has been going on for centuries in English literature, from Chaucer to Bront~: Jane Eyre confides, "I had learned to love Mr. Rochester; I could not unlove him now." What sets latter-day un-verbs apart from these historical examples is that the "reality rewind" is no longer a flight of counterfactual fancy: it’s built right into the interfaces that we use to make sense of our shared virtual worlds. What do you think the author is going to talk about following the last paragraph
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"What’s done cannot be undone," moaned Lady Macbeth in her famous sleepwalking scene. If she woke up in the 21st century, she would be pleased to discover that whatever can be done can be undone, too. Or perhaps it just seems that way in the new social spaces we are carving for ourselves online. On popular web sites devoted to social networking, innovative verbs have been springing up to describe equally innovative forms of interactions: you can friend someone on Facebook; follow a fellow user on Twitter; or favorite a video on YouTube. Change your mind You can just as easily unfriend, unfollow or unfavorite with a click of the mouse. The recent un-trend has also seeped into the world of advertising. KFC is marketing its new Kentucky Grilled Chicken with the tagline "UNthink: Taste the UNfried Side of KFC." The cellphone company MetroPCS challenges you to "Unlimit Yourself," while its competitor Boost Mobile wants you to get "UNoverage’D" and "UNcontract’D" (ridding yourself of burdensome overage fees and contracts). Even victims of the financial downturn can seek solace in un-: ABC broadcast a special report in May telling viewers how to get "Un-Broke." Where did all of this un- activity come from Ever since Old English, the un- prefix has come in two basic flavors. It can be used like the word "not" to negate adjectives (unkind, uncertain, unfair) and the occasional noun (unreason, unrest, unemployment). Or it can attach to a verb to indicate the reversal of an action (unbend, unfasten, unmask). Both kinds of un-are ripe for creating new words. The negative variety of the prefix has been particularly fertile for spinning off nouns, at least since 7-Up first branded itself as the "Un-Cola" in the late 1960s. In the business world we now find unconferences and unmarketing, predicated on the notion that we need to rethink traditional models of conferences and marketing. And beware of unnovation, the opposite of innovation. But it’s the reversible un- that has really been getting a workout lately, even more so than its semantic sibling de- (as in declutter or defragment). Our expectations that any action can be taken back have been primed by a few decades of personal computing, which injected the founding metaphor of "undoing" into the common consciousness. An early glimmer of our Age of Undoing appeared in a prescient 1976 research report by LanceA. Miller and JohnC. Thomas ofI.B.M., drably titled "Behavioral Issues in the Use of Interactive Systems." "It would be quite useful," Miller and Thomas observe, "to permit users to ’take back’ at least the immediately preceding command (by issuing some special ’undo’ command)." Useful indeed! The undo command would become a crucial feature of text editors and word processors in the PC era, assigned the now-familiar keyboard shortcut of Control-Z by programmers at the research center Xerox PARC. In the software of the 80’s, some undo commands became "multilevel," allowing users to take back a whole series of actions (called the undo stack), not just the most recent one. Ad-hoc un- verbs began to emerge for these reversible innovations. In 1984, the software company New Star introduced the unerase command for its word-processing program NewWord, whileI.B.M.’s VisiWord countered with undelete. From there it was a quick step to unbolding, unitalicizing and even un-underlining your errantly formatted text. The Yale University linguist Laurence R. Horn sees an earlier technological metaphor at work in the flurry of un- verbs. As Horn writes in "Uncovering the Un-Word," a paper in the journal Sophia Linguistica: "The prevailing sense is that for something to unhappen, the tape of reality must be set to Rewind. That this is a practical impossibility . . . does not make the metaphor any the less attractive." Rewinding the tape of reality is an appealing metaphor in science fiction, unsurprisingly. Nancy Etchemendy’s young-adult novel, "The Power of Un," features a middle-school student who operates a gizmo called "The Unner" to go back in time and undo past events. Songwriters have also made poetic use of the un- prefix to imagine the reversal of irreversible things, notably falling in and out of love. It’s a useful lyrical trick in such genres as folk rock (Lucinda Williams’s "Unsuffer Me"), R & B (Toni Braxton’s "Un- Break My Heart") and country (Lynn Anderson’s "How Can I Unlove You"). But as Horn points out, imaginary unloving has been going on for centuries in English literature, from Chaucer to Bront~: Jane Eyre confides, "I had learned to love Mr. Rochester; I could not unlove him now." What sets latter-day un-verbs apart from these historical examples is that the "reality rewind" is no longer a flight of counterfactual fancy: it’s built right into the interfaces that we use to make sense of our shared virtual worlds. What is true about the un-verbs used nowadays
"What’s done cannot be undone," moaned Lady Macbeth in her famous sleepwalking scene. If she woke up in the 21st century, she would be pleased to discover that whatever can be done can be undone, too. Or perhaps it just seems that way in the new social spaces we are carving for ourselves online. On popular web sites devoted to social networking, innovative verbs have been springing up to describe equally innovative forms of interactions: you can friend someone on Facebook; follow a fellow user on Twitter; or favorite a video on YouTube. Change your mind You can just as easily unfriend, unfollow or unfavorite with a click of the mouse. The recent un-trend has also seeped into the world of advertising. KFC is marketing its new Kentucky Grilled Chicken with the tagline "UNthink: Taste the UNfried Side of KFC." The cellphone company MetroPCS challenges you to "Unlimit Yourself," while its competitor Boost Mobile wants you to get "UNoverage’D" and "UNcontract’D" (ridding yourself of burdensome overage fees and contracts). Even victims of the financial downturn can seek solace in un-: ABC broadcast a special report in May telling viewers how to get "Un-Broke." Where did all of this un- activity come from Ever since Old English, the un- prefix has come in two basic flavors. It can be used like the word "not" to negate adjectives (unkind, uncertain, unfair) and the occasional noun (unreason, unrest, unemployment). Or it can attach to a verb to indicate the reversal of an action (unbend, unfasten, unmask). Both kinds of un-are ripe for creating new words. The negative variety of the prefix has been particularly fertile for spinning off nouns, at least since 7-Up first branded itself as the "Un-Cola" in the late 1960s. In the business world we now find unconferences and unmarketing, predicated on the notion that we need to rethink traditional models of conferences and marketing. And beware of unnovation, the opposite of innovation. But it’s the reversible un- that has really been getting a workout lately, even more so than its semantic sibling de- (as in declutter or defragment). Our expectations that any action can be taken back have been primed by a few decades of personal computing, which injected the founding metaphor of "undoing" into the common consciousness. An early glimmer of our Age of Undoing appeared in a prescient 1976 research report by LanceA. Miller and JohnC. Thomas ofI.B.M., drably titled "Behavioral Issues in the Use of Interactive Systems." "It would be quite useful," Miller and Thomas observe, "to permit users to ’take back’ at least the immediately preceding command (by issuing some special ’undo’ command)." Useful indeed! The undo command would become a crucial feature of text editors and word processors in the PC era, assigned the now-familiar keyboard shortcut of Control-Z by programmers at the research center Xerox PARC. In the software of the 80’s, some undo commands became "multilevel," allowing users to take back a whole series of actions (called the undo stack), not just the most recent one. Ad-hoc un- verbs began to emerge for these reversible innovations. In 1984, the software company New Star introduced the unerase command for its word-processing program NewWord, whileI.B.M.’s VisiWord countered with undelete. From there it was a quick step to unbolding, unitalicizing and even un-underlining your errantly formatted text. The Yale University linguist Laurence R. Horn sees an earlier technological metaphor at work in the flurry of un- verbs. As Horn writes in "Uncovering the Un-Word," a paper in the journal Sophia Linguistica: "The prevailing sense is that for something to unhappen, the tape of reality must be set to Rewind. That this is a practical impossibility . . . does not make the metaphor any the less attractive." Rewinding the tape of reality is an appealing metaphor in science fiction, unsurprisingly. Nancy Etchemendy’s young-adult novel, "The Power of Un," features a middle-school student who operates a gizmo called "The Unner" to go back in time and undo past events. Songwriters have also made poetic use of the un- prefix to imagine the reversal of irreversible things, notably falling in and out of love. It’s a useful lyrical trick in such genres as folk rock (Lucinda Williams’s "Unsuffer Me"), R & B (Toni Braxton’s "Un- Break My Heart") and country (Lynn Anderson’s "How Can I Unlove You"). But as Horn points out, imaginary unloving has been going on for centuries in English literature, from Chaucer to Bront~: Jane Eyre confides, "I had learned to love Mr. Rochester; I could not unlove him now." What sets latter-day un-verbs apart from these historical examples is that the "reality rewind" is no longer a flight of counterfactual fancy: it’s built right into the interfaces that we use to make sense of our shared virtual worlds. The un-verb can be found in the following EXCEPT ______.
男性，42岁，右上腹痛3周，胀痛，呈持续性。既往有乙型肝炎病史7年。B超显示肝右叶一7cm×5cm不均低回声区，边界不清。 此时治疗应选择（）
When scientists at the Australian Institute of Sport recently decided to check the Vitamin D status of some of that country’s elite female gymnasts, their findings were fairly alarming. Of the 18 gymnasts tested, 15 had levels that were "below current recommended guidelines for optimal bone health," the study’s authors report. Six of these had Vitamin D levels that would qualify as medically deficient. Unlike other nutrients, Vitamin D can be obtained by exposure to ultraviolet radiation from sunlight, as well as through foods or supplements. Of course, female gymnasts are a unique and specialized bunch, not known for the quality or quantity of their diets, or for getting outside much. But in another study presented at a conference earlier this year, researchers found that many of a group of distance runners also had poor Vitamin D status. Forty percent of the runners, who trained outdoors in sunny Baton Rouge, Louisiana, had insufficient Vitamin D. "It was something of a surprise," says D. Enette LarsonoMeyer, an assistant professor in the Department of Family and Consumer Sciences at the University of Wyoming and one of the authors of the study. Vitamin D is an often overlooked element in athletic achievement, a "sleeper nutrient," says John Anderson, a professor emeritus of nutrition at the University of North Carolina and one of the authors of a review article published online in May about Vitamin D and athletic performance. Vitamin D once was thought to he primarily involved in bone development. But a growing body of research suggests that it’s vital in multiple different bodily functions, including allowing body cells to utilize calciul-n (which is essential for cell metabolism), muscle fibers to develop and grow normally, and the immune system to function properly. "Almost every cell in the body has receptors" for Vitamin D, Anderson says. "It can up-regulate and down-regulate hundreds, maybe even thousands of genes," Larson-Meyer says. "We’re only at the start of understanding how important it is." But many of us, it seems, no matter how active and scrupulous we are about health, don’t get enough Vitamin D. Nowadays, "many people aren’t going outside very much," Johnson says, and most of us assiduously apply sunscreen and take other precautions when we do. The Baton Rouge runners, for instance, most likely "ran early in the morning or late in the day," Larson-Meyer says, reducing their chances of heat stroke or sunburn, but also reducing their exposure to sunlight. Meanwhile, dietary sources of Vitamin D are meager. Cod-liver oil provides a whopping dose. But a glass of fortified milk provides a fraction of what scientists now think we need per day. (A major study published online in the joumal Pediatrics last month concluded that more than 60 percent of American children, or almost 51 million kids, have "insufficient" levels of Vitamin D and another 9 percent, or 7.6 million children, are clinically "deficient," a serious condition. Cases of childhood rickets, a bone disease caused by lack of Vitamin D, have been rising in the U.S. in recent years.) Although few studies have looked closely at the issue of Vitamin D and athletic performance, those that have are suggestive. A series of strange but evocative studies undertaken decades ago in Russia and Germany, for instance, hint that the Eastern Bloc nations may have depended in part on sunlamps and Vitamin D to produce their preternaturally well-muscled and world-beating athletes. In one of the studies, four Russian sprinters were doused with artificial, ultraviolet light. Another group wasn’t. Both trained identically for the 100-meter dash. The control group lowered their sprint times by 1.7 percent. The radiated runners, in comparison, improved by an impressive 7.4 percent. More recently, when researchers tested the vertical jumping ability of a small group of adolescent athletes, Larson-Meyer says, "they found that those who had the lowest levels of Vitamin D tended not to jump as high," intimating that too little of the nutrient may impair muscle power. Low levels might also contribute to sports injuries, in part because Vitamin D is so important for bone and muscle health. In a Creighton University study of female naval recruits, stress fractures were reduced significantly after the women started taking supplements of Vitamin D and calcium. A number of recent studies also have shown that, among athletes who train outside year-round, maximal oxygen intake tends to be highest in late summer, Johnson says. The athletes, in other words, are fittest in August, when ultraviolet radiation from the sun is near its zenith. They often then experience an abrupt drop in maximal oxygen intake, beginning as early as September, even though they continue to train just as hard. This decline coincides with the autumnal lengthening of the angle of sunlight. Less ultraviolet radiation reaches the earth and, apparently, sports performance suffers. When can we get the most Vitamin D
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