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序号

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4997

A significant number of complex repair jobs carried out by Ace Repairs have to be reworked under the company's warranty. The reworked jobs are invariably satisfactory. When initial repairs are inadequate, therefore, it is not because the mechanics lack competence; rather, there is clearly a level of focused concentration that complex repairs require that is elicited more reliably by rework jobs than by first-time jobs.

The argument above assumes which of the following?

333

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题目： A positive integer n is said to be "prime-saturated" if the product of all the different positive prime factors of n is less than the square root of n. What is the greatest two-digit prime-saturated integer?

197

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题目： A point on the edge of a fan blade that is rotating in a plane is 10 centimeters from the center of the fan. What is the distance traveled, in centimeters, by this point in 15 seconds when the fan runs at the rate of 300 revolutions per minute?

181

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题目： If $$\frac{1}{2}$$ of the air in a tank is removed with each stroke of a vacuum pump, what fraction of the original amount of air has been removed after 4 strokes?

148

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题目： If x, y, and k are positive numbers such that $$(\frac{x}{x+y})({10})+(\frac{y}{x+y})({20})=k$$ and if $$x<{y}$$ which of the following could be the value of k?

4041

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题目：

The university science library, as most libraries, prohibits students to borrow rare, expensive, or popular reference materials; such materials are designated for use in the library only.

4042

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题目：

The art of Michelangelo, the inventions of Edison, and Shakespeare's plays all represent great achievements in human history.

4043

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题目：

Despite their numerous attempts to do so, scientists have not been able to sustain a controlled nuclear fusion reaction.

4044

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题目：

Art experts have attributed the enduring intrigue of Leonardo da Vinci's Mona Lisa to everything from having an enigmatic smile, which was never explained, to her association with the rich and powerful families of Europe.

4045

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题目：

Jack Nicklaus, who solidified his legendary status with an improbable victory at the famed Augusta National Golf Club in 1986, and Tiger Woods are widely regarded as two of the best golfers in the history of the sport.

4046

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题目：

Hoping to alleviate some of the financial burdens of a growing population, property taxes last year were raised by an eleven percent increase by the county government.

111

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题目： If candy bars that regularly sell for $0.40 each are on sale at two for $0.75, what is the percent reduction in the price of two such candy bars purchased at the sale price?

81

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题目：

Data for a certain biology experiment are given in the table above. If the amount of bacteria present increased by the same fraction during each of the two 3-hour periods shown, how many grams of bacteria were present at 4:00 P.M.?

5034

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题目：

In the years following an eight-cent increase in the federal tax on a pack of cigarettes, sales of cigarettes fell ten percent. In contrast, in the year prior to the tax increase, sales had fallen one percent. The volume of cigarette sales is therefore strongly related to the after-tax price of a pack of cigarettes.

The argument above requires which of the following assumptions?

5035

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题目：

In response to viral infection, the immune systems of mice typically produce antibodies that destroy the virus by binding to proteins on its surface. Mice infected with a herpesvirus generally develop keratitis, a degenerative disease affecting part of the eye. Since proteins on the surface of cells in this part of the eye closely resemble those on the herpesvirus surface, scientists hypothesize that these cases of keratitis are caused by antibodies to herpesvirus.

Which of the following, if true, gives the greatest additional support to the scientists' hypothesis?

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