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  3. Whenever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincident

Whenever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincident

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问题    Whenever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them. The high Himalayas and the Tibetan plateau certainly have extraordinary physical characteristics and the cultures which are found there are also unusual, though not unique. However there is no intention of adopting Montesquieu’ s view of climate and soil as cultural determinants. The ecology of a region merely poses some of the problems faced by the inhabitants of the region, and while the problems facing a culture are important to its development, they do not determine it.
   The appearance of the Himalayas during the late Tertiary Period and the accompanying further raising of the previously established rages had a marked effect on the climate of the region. Primarily, of course, it blocked the Indian monsoon (季风)from reaching Central Asia at all. Secondarily, air and moisture from other directions were also reduced.
   Prior to the raising of the Himalayas, the land now forming the Tibetan uplands had a dry, continental  climate with vegetation and animal life similar to that of much of the rest of the region on the same parallel, but somewhat different than that of the areas farther north, which were already drier. With the coming of the Himalayas and the relatively sudden drying out of the region; there was a severe thinning out of the animal and plant population. The ensuing incomplete Pleistocene glaciations (冰蚀) had a further  thinning effect, but significantly did not wipe out life in the area. Thus after the end of the glaciation there were only a few varieties of life extant from the original continental species. Isolated by the Kunlun range from the Tarim basin and Turfan depression, species which had already adapted to the dry steppe climate, and would otherwise have been expected to flourish in Tibetan, the remaining native fauna and flora(动植物) multiplied. Armand describes the Tibetan fauna as not having great variety, but being "striking" in the abundance of the particular species that are present. The plant life is similarly limited in variety, with some observers finding no more than seventy varieties of plants in even the relatively fertile Eastern Tibetan valleys, with fewer than ten food crops. Tibetan "teat" is a major staple, perhaps replacing the unavailable vegetables.
   The difficulties of living in an environment at once dry and cold. and populated with species more usually found in mere hospitable climates, are great. These difficulties may well have influenced the  unusual polyandrous(一妻多夫制) societies typical of the region. Lattimore sees the maintenance of multiple-husband households as being preserved from earlier forms by the harsh conditions of the Tibetan uplands, which permitted no experimentation and "froze" the cultures which came there. Kawakita, on the other hand, sees the polyandry as a way of easily permitting the best householder to become the head husband regardless of age. His detailed studies of the Bhotea village of Tsumje do seem to support this idea of polyandry as a method of talent mobility is a situation where even the best talent is barely enough for survival.
   In sum, though arguments can be made that a pre-existing polyandrous system was strengthened and preserved (insofar as it has been) by the rigors of the land, it would certainly be an overstatement to lay causative factors of any stronger nature to the ecological influences in this case.
The author’s knowledge of Tibet is probably  ______.
选项 A、based on firsthand experience
B、the result of lifelong studies
C、derived from books only
D、limited to geological history
答案C
解析 文中第一段涉及了“Montesquieu’s view”；第三段中引用了“Armand”的描述；第四段中讲到了“Lattimore”和“Kawakita”的看法。作者对西藏的知识应该是从书本中获得的，文章也并没有涉及作者自己的研究和经历；因此答案为C。
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