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题目： A certain roller coaster has 3 cars, and a passenger is equally likely to ride in any 1 of the 3 cars each time that passenger rides the roller coaster. If a certain passenger is to ride the roller coaster 3 times, what is the probability that the passenger will ride in each of the 3 cars?

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Five hundred million different species of living creatures have appeared on Earth, nearly 99 percent of them vanishing.

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题目： In 1997 there were 300 female employees at Company C. If the number of female employees at Company C increased by 60 percent from 1977 to 1987, by what percent did the number of female employees at Company C increase from 1987 to 1997?(1)From 1977 to 1997 the number of female employees increased by 200 percent at CompanyC.(2)In 1977 there were 100 female employees at Company C.

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Scientists claim that the discovery of the first authenticated mammal bones in amber could provide important clues of determining, in addition to how, when mammals colonized the islands of the West Indies.

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In 1981 children in the United States spent an average of slightly less than two and a half hours a week doing household chores; by 1997 they had spent nearly six hours a week.

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Finally reaching a decision on an issue that has long been politically charged in the Pacific Northwest, politicians decided to postpone by at least five years an ambitious plan to protect wild salmon and other endangered fish, instead of which they proposed a series of smaller steps, by which they intend to protect the fish.

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Contrary to financial analysts, who predicted last year that the market for home computers would dwindle, the personal computer industry continued to show strong growth in the first quarter of this year.

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Known today by a name they would not have recognized-Anasazi, Navajo for "ancient enemies'-the ancestors of the modern Zuni and Hopi built and then, for reasons still mysterious, abandoned the complex roads and structures of the domain they ruled a millennium ago in the American southwest.

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Most of Portugal's 250,000 university students boycotted classes in a one-day strike to protest a law that requires them to contribute $330 a year toward the cost of higher education, previously paying $7 per year.

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题目： A literature department at a small university in an English-speaking country is organizing a two-day festival in which it will highlight the works of ten writers who have been the subjects of recent scholarly work by the faculty. Five writers will be featured each day. To reflect the department's strengths, the majority of writers scheduled for one of the days will be writers whose primary writing language is not English. On the other day of the festival, at least four of the writers will be women. Neither day should have more than two writers from the same country. Departmental members have already agreed on a schedule for eight of the writers. That schedule showing names, along with each writer's primary writing language and country of origin, is shown. Day 1:Achebe (male, English, Nigeria)Weil (female, French, France)Gavalda (female, French, France)Barrett Browning (female, English, UKDay 2:Rowling (female, English, UK)Austen (female, English, UK)Ocantos (male, Spanish, Argentina)Lu Xun (male, Chinese, ChinSelect a writer who could be added to the schedule for either day. Then select a writer who could be added to the schedule for neither day. Make only two selections, one in each column.

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题目： Of the mutual funds on a select list, $$\frac{1}{3}$$ have 5-star ratings, and $$\frac{2}{5}$$ of the remaining funds have 4-star ratings. If the remaining 300 funds on the list have 3-star ratings, how many funds are on the list?

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题目： Each of 20 parents chose one of five days from Monday through Friday to attend parent-teacher conferences. If more parents chose Monday than Tuesday, did at least one of the parents choose Friday?(1) None of the five days was chosen by more than 5 parents.(2) More parents chose Monday than Wednesday.

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题目： In the xy-plane, does the point (a, b) lie above the line y = x ?(1) a = 2(2) b = a + 2

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题目： If $${x}≠{0}$$, then $$({x}+\frac1 x)^{2}-({x}-\frac1 x)^{2}=$$

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题目： If $$\frac{x+y}{z} >{0}$$, is $$x < 0$$?(1)$$ x<{y}$$(2) $$z<0$$