OG19新题 题目总数：142 做题总人数：8452 平均准确率：75.5%
There are 2 groups of students who took a history test. Was the average (arithmetic mean) score of the students in Group A higher than the average score of the students in Group B who took the test?(1) Of the students who took the test, 10 were in Group A and 12 were in Group B.(2) On the test, the highest score achieved was achieved by a Group B student and the lowest score achieved was achieved by a Group A student.
来源：OG21新题 366人已做 其他难度 96.2%正确率
In the xy-coordinate plane, what are the x-coordinates of the four vertices of square JKMN ?(1) J and M are on the x-axis, and K and N are on the y-axis.(2) The center of the square is at the origin.
来源：OG21新题 378人已做 其他难度 88.1%正确率
In the xy-coordinate plane above, what are the coordinates of point N ?(1) Triangle MNP is equilateral.(2) Point M has coordinates (−4,0).
来源：OG21新题 385人已做 其他难度 93.2%正确率
Let S be the set of all positive integers having at most 4 digits and such that each of the digits is 0 or 1 What is the greatest prime factor of the sum of all the numbers in S?
来源： 353人已做 730难度 66.9%正确率
来源： 158人已做 650难度 43.7%正确率
来源： 155人已做 650难度 83.2%正确率
来源： 158人已做 680难度 69%正确率
来源： 154人已做 650难度 68.2%正确率
来源： 156人已做 650难度 95.5%正确率
来源： 159人已做 600难度 85.5%正确率
In parts of South America, vitamin-A deficiency is a serious health problem, especially among children. In one region, agriculturists hope to improve nutrition by encouraging farmers to plant a new variety of sweet potato called SPK004 that is rich in betacarotene, which the body converts into vitamin A. The plan has good chances of success, since sweet potato is a staple of the region’s diet and agriculture, and the varieties currently grown contain little beta-carotene. Which of the following, if true, most strongly supports the prediction that the plan will succeed?
Which of the following is included in the discussion of the cursorial hypothesis but not in the discussion of the arboreal hypothesis?
It is illegal to advertise prescription medications in Hedland except directly to physicians, either by mail or in medical journals. A proposed law would allow general advertising of prescription medications. Opponents object that the general population lacks the specialized knowledge to evaluate such advertisements and might ask their physicians for inappropriate medications. But since physicians have the final say as to whether to prescribe a medication for a patient, inappropriate prescriptions would not become more common. Which of the following would it be most useful to establish in order to evaluate the argument?
【OG20-P595-717题】Which of the following most logically completes the passage?According to the last pre-election poll in Whippleton, most voters believe that the three problems government needs to address, in order of importance, are pollution, crime, and unemployment. Yet in the election, candidates from parties perceived as strongly against pollution were defeated, while those elected were all from parties with a history of opposing legislation designed to reduce pollution.These results should not be taken to indicate that the poll was inaccurate, however, since __________
【OG20-P594-715题】Several industries have recently switched at least partly from older technologies powered by fossil fuels to new technologies powered by electricity. It is thus evident that less fossil fuel is being used as a result of the operations of these industries than would have been used if these industries had retained their older technologies.Which of the following, if true, most strengthens the argument above?
In July 1965 Mariner IV passed by Mars and took the first-ever close-up photographs of another planet, which showed that the Martian surface was like that of the Moon's in that it was pockmarked by moonlike craters and was dry and apparently dead.
A survey of entrepreneurs who started companies last year shows that while virtually all did substantial preparatory research and planning, only half used that work to produce a formal business plan. Since, on average, the entrepreneurs without formal plans secured the capital they needed in half the time of those with plans, these survey results indicate that, in general, formal plans did not help the entrepreneurs who produced them to secure the capital they needed. Which of the following, if true, most seriously weakens the argument?
【OG20-P181-230题】The value of is how many times the value of 2-17?
To Josephine Baker, Paris was her home long before it was fashionable to be an expatriate, and she remained in France during the Second World War as a performer and an intelligence agent for the Resistance.
【OG20-P459-606题】The author of the passage mentions "escape velocity" in order to help explain which of the following?