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問題と選択肢が一致していないのでもう1度OGを見直したほうがいいかもしれません。この問題は連続問題なので、問題が入れ子になっています。
> 度々お世話になります。
> まず質問の＜if true and known by the ranchers＞という挿入句部分の訳がわかりません。また、OG解説には<D indicates that,contrary to Hardin's claim,it is in each rancher's self-interest not to overuse common land,which would explain why common lands are in relatively good shape.> とあるのですが、問題文が理解できていないせいなのかこれをよんでも正解がDである理由がわかりません。
> どなたか教えて下さい。宜しくお願いします。
>
> Hardin argue that grazing land held in common(that is, open to any user) would always be used less carefully than private grazing land.Each rancher would be tempted to overuse common land because the benefits would accrue to the individual,while the costs of reduced land quality that results from overuse would be spread among all users.But a study comparing 217 million acres of common grazing land with ree million acres of private grazing land showed that the common land was in better condition.
>
> Which of the following, if true and known by the ranchers, would best help explain the results of the study?
>
> A)Did any of the ranchers whose land was studied use both common and private land?
> B)Did the ranchers whose land was studied tend to prefer using common land over using private land for grazing?
> C)Was the private land that was studied of comparable quality to the common land before either was used for grazing?
> D)Were the users of the common land that was studied at least as prosperous as the users of the private land?
> E)Were there any owners of herds who used only common land, and no private land, for grazing?
>
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