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题目： A certain junior class has 1,000 students and a certain senior class has 800 students. Among these students, there are 60 sibling pairs, each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?

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Critical-thinking instruction is predicted on two assumptions: that there are clearly identifiable thinking skills that students can be taught to recognize and apply appropriately, and if recognized and applied, students will become more effective thinkers.

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题目： Biologists working in Spain say that their discovery of teeming life in a highly acidic river may not only broaden the search for life, or for evidence of past life, on other planets but also show that a number of forms of microscopic life can adapt to conditions that scientists have long thought hostile to all but the hardiest bacteria.

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题目： Researchers have announced that the magnetic fields emitted by one manufacturer's security surveillance system, of which type there are 200,000 worldwide, can interfere with pacemakers and that this interaction can bring on missed or irregular heartbeats, nausea, breathlessness, dizziness, and even fainting.

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Besides yielding such psychological rewards as relief from stress, deep relaxation, if practiced regularly, can strengthen the immune system and produce a host of other physiological benefits.

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Medicare, the United States government's health insurance program for the elderly and disabled, covers the full cost of home health care, but not with other nonhospital services where 20 percent of the costs must be paid by beneficiaries.

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题目： Arctic terns, being true long-distance migrants, they nest in coastal wetlands of northern Europe but fly south for thousands of miles to spend the European winters in Antarctica.

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题目： According to a recent survey of municipal services, the city's streets could be cleaner, its fire code be better enforced, and its crime rate reduced if the current administration improved its management practices.

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题目： The proposed budget includes more than $1 billion in cuts that will shrink the police department through attrition, have halted some ambulance shifts, and have suspended plastic and glass recycling.

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题目： Problems at a California securities firm rippled through the penny-stock market, forcing at least one Florida brokerage firm to stop trading, and it sent the shares of several small companies tumbling.

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题目： The soft drink company's flat earnings for the second quarter reflect the success of both its restructured global bottling system and the extent to which poor currency exchange rates keep down profits for multinational companies

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Navigators have known for thousands of years that the ocean has variable currents, but it is only in the last half century that a reasonably clear picture has emerged of the patterns and causes of ocean currents.

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The principal feature of the redesigned checks is a series of printed instructions that the company hopes will help merchants confirm a check's authenticity, which includes reminders to watch the endorsement, compare signatures, and view the watermark while holding the check to the light.

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题目： The graph depicts the per-person dietary intake of foods in 4 categories for the people of Nation X for the years 1909 through 2000. A decline in consumption in all 4 categories strongly suggests an overall food shortage rather than a simple change in dietary pattern.From each drop-down menu, select the option that creates the most accurate statement about food consumption in Nation X based on the information provided.The graph suggests that Nation X most likely experienced a food shortage shortly before the year [s[0]].For the year that the total dietary intake of carbohydrates was lowest, the per-person intake of carbohydrates was approximately [s[1]] times the per-person intake of dietary fiber.

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题目： The graph depicts the per-person dietary intake of foods in 4 categories for the people of Nation X for the years 1909 through 2000. A decline in consumption in all 4 categories strongly suggests an overall food shortage rather than a simple change in dietary pattern.From each drop-down menu, select the option that creates the most accurate statement about food consumption in Nation X based on the information provided.The graph suggests that Nation X most likely experienced a food shortage shortly before the year [s[0]] For the year that the total dietary intake of carbohydrates was lowest, the per-person intake of carbohydrates was approximately [s[1]] times the per-person intake of dietary fiber.