A computer equipped with signature‐recognition software, which restricts access to a computer to those people whose signatures are on file, identifies a person’s signature by analyzing not only the form of the signature but also such characteristics as pen pressure and signing speed. Even the most adept forgers cannot duplicate all of the characteristics the program analyzes. Which of the following can be logically concluded from the passage above?
来源：OG2022分册 27人已做 其他难度 77.8%正确率
At several locations on the northwest coast of North America are formations known as chevrons—wedge-shaped formations of mounded sediment—pointing toward the ocean. Most geologists take them to have been formed by erosion, but recently other scientists have proposed that they were thrown up from the ocean by massive waves triggered by meteor impacts in the Pacific Ocean. Which of the following, if discovered, would most help in deciding which hypothesis is correct?
来源：OG2022分册 16人已做 其他难度 62.5%正确率
Although Ackerburg’s subway system is currently operating at a deficit, the transit authority will lower subway fares next year. The authority projects that the lower fares will result in a ten percent increase in the number of subway riders. Since the additional income from the larger ridership will more than offset the decrease due to lower fares, the transit authority actually expects the fare reduction to reduce or eliminate the subway system’s operating deficit for next year. Which of the following, if true, provides the most support for the transit authority’s expectation of reducing the subway system’s operating deficit?
来源：OG2022分册 11人已做 其他难度 100%正确率
In its search for new technologies for solar energy that can produce lower-cost electricity, Smith-Diatom is developing a new way to make dye-sensitive solar cells, in which photons strike light-sensitive dyes. The process uses diatoms, which are unicellular algae that have silicon shells with a complex structure. First, the organic material is removed, and then the shells are coated with a titanium dioxide film that acts as a semiconductor. The diatoms’ structure results in more photon activity and thus more efficient production of electricity than with current dye-sensitized solar cells, which in turn lowers the cost. Which of the following considerations would, if true, most strongly support the hypothesis that the plan, if implemented, will produce low-cost electricity from dye-sensitive solar cells?
来源：OG2022分册 11人已做 其他难度 72.7%正确率
The XCT automobile is considered less valuable than the ZNK automobile, because insurance companies pay less, on average, to replace a stolen XCT than a stolen ZNK. Surprisingly, the average amount insurance companies will pay to repair a car involved in a collision is typically higher for the XCT than for the ZNK. One insurance expert explained that repairs toXCT automobiles are especially labor-intensive, and labor is a significant factor in collision repair costs. Which of the following, if true, most strongly supports the insurance expert’s explanation?
来源：OG2022分册 17人已做 其他难度 0%正确率
Stockholders have been critical of the Flyna Company, a major furniture retailer, because most of Flyna’s furniture is manufactured in Country X from local wood, and illegal logging is widespread there. However, Flyna has set up a certification scheme for lumber mills. It has hired a staff of auditors and forestry professionals who review documentation of the wood supply of Country X’s lumber mills to ensure its legal origin, make surprise visits to mills to verify documents, and certify mills as approved sources of legally obtained lumber. Flyna uses only lumber from certified mills. Thus, Flyna’s claim that its Country X wood supply is obtained legally is justified. Which of the following, if true, would most undermine the justification provided for Flyna’s claim?
来源：OG2022分册 16人已做 其他难度 50%正确率
OG2021-803A product that represents a clear technological advance over competing products can generally command a high price. Because technological advances tend to be quickly surpassed and companies want to make large profits while they still can, many companies charge the greatest price the market will bear when they have such a product. But large profits on the new product will give competitors a strong incentive to quickly match the new product's capabilities. Consequently, the strategy to maximize overall profit from a new product is to charge less than the greatest possible price. In the argument above, the two portions in boldface play which of the following roles?
来源：OG21新题 3730人已做 其他难度 73.7%正确率
OG2021-798Political Strategist: The domestic policies of our opponents in Party X are contrary to the priorities of many middle-class voters. Yet some of these same voters are supporters of Party X and its candidates due to the party's appeals about foreign policy. In order to win these voters back, we in Party Y must prove to middle-class voters that Party X does not represent their priorities with respect to domestic policy. Which of the following would, if true, most strongly suggest that the political strategist's plan is unlikely to succeed?
来源：OG21新题 3158人已做 其他难度 72.6%正确率
OG2021-786Lockeport's commercial fishing boats use gill nets, which kill many of the netted fish, including some fish of endangered species. The fishing commission has proposed requiring the use of tent nets, which do not kill fish; boat crews would then throw back fish of endangered species. Profitable commercial fishing boats in similar areas have already switched over to tent nets. The proposal can therefore be implemented without economic harm to Lockeport's commercial fishing boat operators. Which of the following, if true, casts the most serious doubt on the argument made for the proposal?
来源：OG21新题 3142人已做 其他难度 76%正确率
OG2021-778The country of Virodia has, until now, been barely self-sufficient in both meat and grain. Greater prosperity there has gone hand in hand with steadily increasing per capita consumption of meat, and it takes several pounds of grain used as feed to produce one pound of meat. Per capita income is almost certain to rise further, yet increases in domestic grain production are unlikely. Which of the following is most strongly supported by the information given?
来源：OG21新题 3182人已做 其他难度 68.8%正确率
【OG20-P290-424题】The only articles of clothing in a certain closet are shirts, dresses, and jackets. The ratio of the number of shirts to the number of dresses to the number of jackets in the closet is 9:4:5, respectively. If there are more than 7 dresses in the closet, what is the total number of articles of clothing in the closet?(1) The total number of shirts and jackets in the closet is less than 30.(2) The total number of shirts and dresses in the closet is 26.
Sasha: It must be healthy to follow a diet high in animal proteins and fats. Human beings undoubtedly evolved to thrive on such a diet, since our prehistoric ancestors ate large amounts of meat. Jamal: But our ancestors also exerted themselves intensely in order to obtain this food, whereas most human beings today are much less physically active. Jamal responds to Sasha by doing which of the following?
【OG20-P289-410题】If r and s are positive integers, can the fraction r/s be expressed as a decimal with only a finite number of nonzero digits?(1) s is a factor of 100.(2) r is a factor of 100.
【OG20-P181-228题】How many of the integers that satisfy the inequality (x+2)(x+3)x−2 ≥0 are less than 5？
If ab ≠ 0 and points (-a, b) and (-b, a) are in the same quadrant of the xy-plane, is point (-x, y) in this same quadrant?(1) xy > 0(2) ax > 0
【OG18-P162-111题】At a certain instant in time, the number of cars, N, traveling on a portion of a certain highway can be estimated by the formula N= 20Ld600+s2 where L is the number of lanes in the same direction, d is the length of the portion of the highway, in feet, and s is the average speed of the cars, in miles per hour. Based on the formula, what is the estimated number of cars traveling on a 1/2 mile portion of the Highway if the highway has 2 lanes in the same direction and the average speed of the cars is 40 miles per hour? (5,280 feet =1mile)
Since the 1930s aircraft manufacturers have tried to build airplanes with frictionless wings, shaped so smoothly and perfectly that the air passing over them would not become turbulent.
【OG20-P562-610题】 Arts advocate: Few universities require that students who are specializing in science and technology take many art courses.However, real progress in science and technology requires an element of creativity,which the arts foster. Thus,to help science and technology students succeed in their careers, universities should increase the number of art courses required for them.Which of the following would,if true, most strengthen the argument above?
【OG20-P585-685题】A company has developed a new sensing device that, according to the company's claims, detects weak, ultralow-frequency electromagnetic signals associated with a beating heart. These signals, which pass through almost any physical obstruction, are purportedly detected by the device even at significant distances. Therefore, if the company’s claims are true, their device will radically improve emergency teams ability to locate quickly people who are trapped within the wreckage of collapsed buildings. Which of the following, if true, most strengthens the argument?
【OG20-P814-903题】In the major cities of industrialized countries at the end of the nineteenth century,important public places such as theaters,restaurants,shops,and banks had installed electric lighting ,but electricity was in less than 1 percent of homes,where lighting was still provided mainly by candles or gas.