Some species of tree have been read out of the party by economics-minded forestersbecause they grow too slowly, or have too low a sale vale to pay as timber crops. (4) In Europe, where forestry is ecologically more advanced, the non-commercial tree species are recognized as members of native forest community, to be preserved as such, within reason.
To sum up: a system of conservation based solely on economic self-interest is hopelessly lopsided. (5) It tends to ignore, and thus eventually to eliminate, many elements in the land community that lack commercial value, but that are essential to its healthy functioning. It assumes, falsely, I think, that the economic parts of the biotic clock will function without the uneconomic parts.
答案
Part C (10 points)
1 . 科学家们赶紧拿出某些明显站不住脚的证据来补救,大致说的是如果鸟儿 不能控制昆虫数量的话,昆虫就会把我们吃光。
2. 但是我们至少更倾向于承认这样一种观点:那就是鸟儿的生存是它们的固 有权利,不管其存在与否对我们是否有经济利益。
3. 曾几何时,生物学家似乎过度使用了以下这条证据:这些生物是为了维持 食物链的正常运行去捕食弱小的生物或只捕食“没有价值的”物种。
4 . 在生态林业较为先进的欧洲,没有成为商业化对象的树种被视为原始森林 群落的成员适当地加以保护。
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