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OG19-数学分册
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What is the remainder when $$3^{24}$$ is divided by 5 ?
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OG19-数学分册
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In the figure shown, a square grid is superimposed on the map of a park, represented by the shaded region, in the middle of which is a pond, represented by the black region. If the area of the pond is 5,000 square yards, which of the following is closest to the area of the park, in square yards, including the area of the pond?
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OG19-数学分册
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If the volume of a ball is 32,490 cubic millimeters, what is the volume of the ball in cubic centimeters? (1 millimeter= 0.1 centimeter)
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OG19-数学分册
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A certain manufacturer sells its product to stores in 113 different regions worldwide, with an average (arithmetic mean) of 181 stores per region. If last year these stores sold an average of 51,752 units of the manufacturer's product per store, which of the following is closest to the total number of units of the manufacturer's product sold worldwide last year?
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OG19-数学分册
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A positive integer n is a perfect number provided that the sum of all the positive factors of n, including 1 and n, is equal to 2n. What is the sum of the reciprocals of all the positive factors of the perfect number 28 ?
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OG19-数学分册
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In the figure shown, PQRSTU is a regular polygon with sides of length x. What is the perimeter of triangle PRT in terms of x ?
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OG19-数学分册
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On a certain transatlantic crossing, 20 percent of
80
a ship's passengers held round-trip tickets and also took their cars aboard the ship. If 60 percent of the passengers with round-trip tickets did $$\underline {not}$$ take their cars aboard the ship, what percent of the ship's passengers held round-trip tickets?
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OG19-数学分册
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If x and k are integers and $$(12^{x})(4^{2x+1}) = (2^{k})(3^{2})$$, what is the value of k ?
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OG19-数学分册
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If S is the sum of the reciprocals of the 10 consecutive integers from 21 to 30, then Sis between which of the following two fractions?
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OG19-数学分册
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If the variables, X, Y, and Z take on only the values 10, 20, 30, 40, 50, 60, or 70 with frequencies indicated by the shaded regions above, for which of the frequency distributions is the mean equal to the median?
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OG19-语文分册
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The passage suggests that if a meteorite contained PAHs that were the result of terrestrial contamination, then one would expect which of the following to be true?
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OG19-语文分册 OG20-语文分册
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Which of the following best describes the primary function of lines 11-16?
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OG19-语文分册 OG20-语文分册
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The passage suggests which of the following aboutthe sixteenth-century Native Americans who traded with Europeans on the coast of what is now called New England?
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Determining whether a given population of animals constitutes a distinct species can be difficult because no single accepted definition of the termexists. One approach, called the biological species concept, bases the definition on reproductive compatibility. According to this view,a species is a group of animals that can mate with one another to produce fertile offspring but cannot mate successfully with members of a different group. Yet this idea can be too restrictive. First, mating between groups labeled as different species (hybridization), as often occurs in the canine family, is quite common in nature. Second, sometimes the differences between two populations might not prevent them from interbreeding, even though they are dissimilar in traits unrelated to reproduction; some biologists question whether such disparate groups should be considered a single species.A third problem with the biological species concept is that investigators cannot always determine whether two groups that live in different places are capable of interbreeding. When the biological species concept is dificult to apply, some investigators use phenotype, an organism's observable characteristics, instead. Two groups that have evolved separately are likelyto display measurable differences in many of theirtraits, such as skull size or width of teeth. If the distribution of measurements from one group doesnot overlap with those of another, the two groupsmight reasonably be considered distinct species.
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OG19-语文分册 OG20-语文分册
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Which of the following best describes the function of lines 10-13?
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OG19-语文分册 OG20-语文分册
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The passage suggests that neuroscientists would most likely consider Shaker to be which of the folowing?
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OG19-语文分册 OG20-语文分册
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It can be inferred from the passage that which of the following, if true, would be most likely to influence ethologists' opinions about whether a particular gene in a species is a behavioral gene?
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OG19-语文分册
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The passage indicates which of the following about Du Bois's attitude toward Washington?
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OG19-数学分册
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The points R, T, and U lie on a circle that has radius 4. If the length of arc RTU is $$\frac{4\pi}{3}$$ , what is the length of line segment RU?
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OG19-数学分册
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A survey of employers found that during 1993 employment costs rose 3.5 percent, where employment costs consist of salary costs and fringebenefit costs. If salary costs rose 3 percent and fringe-benefit costs rose 5.5 percent during 1993, then fringe-benefit costs represented what percent of employment costs at the beginning of 1993 ?
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