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In the wake of 11 September, Visionics, a leading manufacturer, issued a fact sheet explaining how its technology could enhance airport security. They called it "protecting civilization from the faces of terror". The company’s share price skyrocketed, as did the stocks of other face-recognition companies, and airports across the globe began installing the software and running trials. As the results start to come in, however, the gloss (光滑表面) is wearing off. No matter what you might have heard about face-recognition software, Big Brother is not so good as expected. The concern was based largely on an independent assessment of face-recognition systems carried out in 2000 in the U. S. by the Department of Defense. These tests found that to catch 90 percent of suspects at an airport, face-recognition software would have to raise a huge number of false alarms. one in three people would end up being dragged out of the line and that’s assuming everyone looks straight at the camera and makes no effort to disguise himself. Results from the recent airport trials would seem to justify that concern. Most face-recognition systems use some kind of geometric technique to translate a picture of a face into a set of numbers that capture its characteristics. once it has identified these boundaries, the software calculates their relative sizes and positions and converts this geometry into what Visionics calls a "faceprint". Feed the software a series of mugshots, and it’ll calculate their faceprints. Then it can monitor live CCTV images for the faces of known suspects. When it finds a match, it raises an alarm. Even if the system does manage to capture a face, the problems aren’t over. The trouble is that a suspect’s faceprint taken from live CCTV is unlikely to match the one in the database in every detail. To give themselves the best chance of picking up suspects, operators can set the software so that it doesn’t have to make an exact match before it raises the alarm. But there’s a price to pay: the more potential suspects you pick up, the more false alarms you get. You have to get the balance just right. Despite the disappointing tests, some people insist that face-recognition technology is good enough to put terrorists off. After all the claims and counter-claims, with no one able to discern(洞察) the truth, the industry may soon have to face up to reality. What is the fatal defect of the system according to the U. S. Department of Defense
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The White HouseWe get up early this morning and (51) a long walk after breakfast. We walked through the business section of the city. I told you yesterday that the city was larger (52) I thought it would be. (53) the business section is smaller than I thought it would be. I suppose that’s (54) Washington is a special kind of city. (55) the people in Washington work for the government. About 9:30 we went to the White House. It’s (56) to the public from 10 till 12, and there was a long line of people waiting to get in. We didn’t have to wait very long, because the line moved (57) quickly.The White House is really white. It is painted every year. And it seems very white, because it’s got beautiful lawns all around it, (58) many trees and shrubs. The grounds (59) about four square blocks. I mean, they’re about two blocks long (60) each side. The part (61) the President lives and works is not open to the public. But the part we saw was beautiful. We went through five of the main rooms. One of them was the library, on the ground floor. On the next floor, there are three rooms named (62) the colors that are. used in them: the Red Room, the Blue Room and the Green Room.The walls are covered with silk (63) . There are (64) old furniture, from the time (65) the White House was first built. And everywhere there are paintings and statues of former presidents and other famous people from history. 61().
为了某种需要，现要绘制一幅代表某个国家7个省——G、I、J、L、P、S、V的地图。 G与除J之外的所有其他5个省相邻。 I恰好与4个省——G、J、P、V相邻。 J恰好与2个省——I和P相邻。 L恰好与2个省——G和V相邻。 P恰好与3个省——G、I、J相邻。 S仅与G相邻。 V恰好与三个省——G、I、L相邻。 恰好要用6种颜色——金色、翡翠色、橄榄色、红色、银色、白色来表示这7个省，每种颜色至少使用一次，每个省在地图上仅用一种颜色，地图颜色的运用遵从以下条件： (1)相邻的省不能使用相同的颜色。 (2)翡翠色和橄榄色不能相邻。 (3)银色和白色不能相邻。 (4)G的颜色是红色。 (5)I用翡翠色。 若V和J在地图上是白色，则S一定是______。
Stanford University 1 Stanford University, famous as one of northern California’s several institutions of higher learning, is sometimes called "the Harvard of the West. " The closeness of Stanford to San Francisco, a city thirty-two miles to the north, gives the university a decidedly cosmopolitan (世界性的) flavor. 2 The students are enrolled mainly from the western United States. But most of the fifty states send students to Stanford, and many foreign students study here, as well. And standards for admission remain high. Young men and women are selected to enter the university from the upper fifteen percent of their high school classes. 3 Not only because of me high caliber(素质)of its students but also because of the desirable location and climate, Stanford has attracted to its faculty some of the world’s most respected scholars. The university staff has included many Nobel prize winners such as Dr. Felix Bloch, Dr. Robert Hofstadter, and Dr. William Shockley in physics. Dr. Author Kornberg and Dr. Joshua Lederberg in medicine. and Dr. Paul J. Flory and Dr. Linus Pauling in chemistry. The Russian novelist Aleksandr Solzhenistsyn has been in residence. Stanford’S undergraduate school of engineering and its graduate schools of business, law, and medicine are especially well-regarded. 4 What is student life like on "The Farm" Culturally. the campus is a magnet for both students and citizens of nearby communities. P1ays, concerts, and operas are performed in the university’s several auditoriums and in its outdoor theater, where graduations are also held. Several film series are presented during the school year. Guest lecturers from public and academic life frequently appear on campus. In the evenings, many students gather to socialize in the Student Union’s coffee house；here the beverages(饮料)and the atmosphere both have a decidedly European flavor. For the sports—minded, the Stanford campus offers highly developed athletic facilities. Team spots, swimming, and track and field activity are a11. very much part of the Stanford picture. So are bicycling and jogging. 5 In addition to financial support from alumni(校友), Stanford receives grants from the government and from private philanthropic(慈善的)foundations。In recent years, government grants have made possible advanced studies in the fields of history, psychology, education, and atomic energy. At present Stanford is carrying out an ambitious building program, financed in part by山e Ford Foundation’s 25. million grant. Recently added to the campus are a new physics building, new school of business, new graduate school of law, new student union, and undergraduate library. On the faculty of the university there are______ .
The White HouseWe get up early this morning and (51) a long walk after breakfast. We walked through the business section of the city. I told you yesterday that the city was larger (52) I thought it would be. (53) the business section is smaller than I thought it would be. I suppose that’s (54) Washington is a special kind of city. (55) the people in Washington work for the government. About 9:30 we went to the White House. It’s (56) to the public from 10 till 12, and there was a long line of people waiting to get in. We didn’t have to wait very long, because the line moved (57) quickly.The White House is really white. It is painted every year. And it seems very white, because it’s got beautiful lawns all around it, (58) many trees and shrubs. The grounds (59) about four square blocks. I mean, they’re about two blocks long (60) each side. The part (61) the President lives and works is not open to the public. But the part we saw was beautiful. We went through five of the main rooms. One of them was the library, on the ground floor. On the next floor, there are three rooms named (62) the colors that are. used in them: the Red Room, the Blue Room and the Green Room.The walls are covered with silk (63) . There are (64) old furniture, from the time (65) the White House was first built. And everywhere there are paintings and statues of former presidents and other famous people from history. 60().
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