Q4 in the past the country of siduria has relied

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Q4: In the past the country of Siduria has relied heavily on imported oil. Siduria recently implemented a program to convert heating systems from oil to natural gas. Siduria already produces more natural gas each year than it burns, and oil production in Sidurian oil fields is increasing at a steady pace. If these trends in fuel production and usage continue, therefore, Sidurian reliance on foreign sources for fuel should decline soon. Which of the following is an assumption on which the argument depends? A. In Siduria the rate of fuel consumption is rising no more quickly than the rate of fuel production. B. Domestic production of natural gas is rising faster than is domestic production of oil in Siduria. C. No fuel other than natural gas is expected to be used as a replacement for oil in Siduria. D. Buildings cannot be heated by solar energy rather than by oil or natural gas. E. All new homes that are being built will have natural-gas-burning heating systems. Answer: ----------------------------------------------------------------------------------------------------------- - Q5 to Q7: According to a theory advanced by researcher Paul Martin, the wave of species extinctions that occurred Line in North America about 11,000 years (5) ago, at the end of the Pleistocene era, can be directly attributed to the arrival of humans, i.e., the Paleoindians, who were ancestors of modern Native Americans. However, anthropologist (10) Shepard Krech points out that large animal species vanished even in areas where there is no evidence to demon- 14
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strate that Paleoindians hunted them. Nor were extinctions confined to large (15) animals: small animals, plants, and insects disappeared, presumably not all through human consumption. Krech also contradicts Martin’s exclusion of climatic change as an explanation by (20) asserting that widespread climatic change did indeed occur at the end of the Pleistocene. Still, Krech attributes secondary if not primary responsibility for the extinctions to the Paleoindians, (25) arguing that humans have produced local extinctions elsewhere. But, according to historian Richard White, even the attribution of secondary responsibility may not be supported (30) by the evidence. White observes that Martin’s thesis depends on coinciding dates for the arrival of humans and the decline of large animal species, and Krech, though aware that the dates (35) are controversial, does not challenge them; yet recent archaeological discoveries are providing evidence that the date of human arrival was much earlier than 11,000 years ago. --------------------------------------------------------------------------------
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