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  3. Reconstructing Ancient Environments P1: Archaeology is particularly important for learning about prehistoric societies, for whom

Reconstructing Ancient Environments P1: Archaeology is particularly important for learning about prehistoric societies, for whom

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问题 Reconstructing Ancient Environments
P1: Archaeology is particularly important for learning about prehistoric societies, for whom there may be no written records to study. Besides, global climates, topographical features and constituents of the Earth’s crust have considerably changed with the passing of time. The first effort archaeologists should make is to use evidence preserved in historical sites to reconstruct the ancient physical environment of a region.
P2: One of the most important sources of information for reconstructing human’s adaptive response to prehistoric environments is the faunal remains found in archaeological sites. Faunal remains are considered to include fish, birds, and mammals. These remains are used to reconstruct past environments and human diet. The prehistoric record of the meat-eating habits of early humans is far from clear about the prevalence of scavenging. One faction of prehistorians argues there is evidence that early humans were primarily scavengers who found the remains of animals killed by lions and other carnivores, and then butchered them. Another faction disagrees, proposing that early humans hunted for their own meat. Marks left by humans cutting up animals with stone tools are now being analyzed to help distinguish between cases in which people butchered animals they had killed themselves and those in which they butchered animals they scavenged from the kills of other animals.
P3: Another source to reconstruct ancient environments comes from the study of the remains of plants cultivated or used by man in ancient times, which have survived in archaeological contexts. Carbon is chemically quite stable, so charred plants (plants converted to charcoal or carbon) and seeds preserve well. Charred plant remains are usually retrieved by flotation: excavated sediments are mixed with water or some other fluid. Heavy fractions will sink to the bottom and less dense organic material such as charred seeds, grains, and charcoal will tend to float to the surface. The importance of such analyses lies in the fact that these plants indicate much about the climates and vegetation of the periods in which the animals lived. For example, there are ongoing debates about when and where various animals were domesticated. If phytoliths (tiny mineral particles formed inside plants) of domesticated grains are found on the teeth of these animals, the probability is high that they were part of an agricultural economy.
P4: Apart from faunal and floral remains, human bodies, especially well-preserved ones, can also be of extraordinary significance to archaeological discoveries. For example, eleven naturally mummified bodies were found in beach sand in northern Chile and date to about 1000 B.C. Chemical reconstruction of their diet demonstrates that one of them was a coca leaf chewer, and they had the kinds of dental problems and missing teeth associated with the sticky starches of an agricultural diet, although their principal food was derived from marine resources with only minor supplementation from terrestrial hunting and food-gathering. Then, during bones analysis, the bodies showed the changes of the bones of the inner ear that are characteristic of people who frequently dive in freezing water.
P5: To better interpret these prehistorical mysteries, a technical specialty is combined with archaeology, which is know as geoarchaeology. ■ Geoarchaeologists’ work frequently involves studying soil and sediments, as well as other geographical alterations, to contribute to an archaeological study. ■ Geoarchaeological analyses also involve many different kinds of questions and techniques. ■ In the Egyptian Delta region, for example, many of the earliest communities were built on large sand-and-gravel mounds created by the Nile River as it deposited the sediments it carried. ■ But many of these communities have been buried under meters of sediment from numerous ancient floods, and by other factors as well. On top of this, the streams feeding into the Nile River in the delta have changed course many times, leaving a maze of crisscrossed, buried river channels. Finding these buried sand-and-gravel mounds and the archaeological sites on them often requires complex geological analyses involving special digging, satellite image analysis, and many other techniques.
The purpose of paragraph 5 is to
选项 A、answer questions about the equipment and techniques used in the Egyptian Delta area
B、describe the earliest communities built on large, sand-and-gravel mounds
C、explain how streams feeding the Nile River in the delta change course over time
D、provide an example of a situation where complex geoarchaeological analyses and techniques are necessary
答案D
解析 【修辞目的题】第五段开头介绍了地质考古学，然后讲地质考古分析还涉及许多不同种类的问题和技术。后面都在讲述埃及三角洲地区地质考古的例子，所以写这段是为了举例说明复杂的地质考古分析和技术是非常重要的。
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