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 2012 수능 외국어 영역 28번 문제
28. Although there are numerous explanations for the fall of the Roman empire, the deeper cause lies in the declining fertility of its soil and the decrease in agricultural yields. Italy was densely forested at the beginning of Roman rule. By the end of the Roman Imperium, however, Italy had been stripped of forest cover. The timber was sold on the open market and the soil converted to crops and pastureland. The cleared soil was rich in minerals and nutrients and provided substantial production yields. Unfortunately, deforestation left the soil exposed to harsh weather. Wind blew across the barren landscapes and water ran down from the mountaintops and slopes, taking the soil with them. Overgrazing of livestock resulted in further deterioration of the soil.
Consequently, Rome’s ___________________ could not provide sufficient energy to maintain its infrastructure and the welfare of its citizens.

① dense forests
② climate changes
③ irrigation system
④ declining population
⑤ agricultural production 
 


2012 임용 지리 11번 문제