单选题
The purpose of the passage is to ______.
A、
analyze the possible causal links between Tibetan ecology and society
B、
describe the social organization of typical Tibetan villages
C、
describe Tibetan fauna and flora
D、
analyze the mysteries of the sudden appearance of the Himalayas
【正确答案】
A
【答案解析】
由第四段“The difficulties of living in an environment…are great．These difficulties may well have influenced the unusual polyandrous(一妻多夫制)societies typical of the region．”可以看出答案为A。整篇文章均围绕这个话题展开，B，C，D三项只是文中部分提及。
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