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托福阅读修辞目的题：Minerals and Plants(2)

2015-08-11 15:39:10来源：网络

　　【托福阅读题型：Minerals and Plants修辞目的题】托福阅读中句子插入题是重要题型之一。根据托福阅读题型不同来进行专项练习，是短期提高托福阅读能力的有效方法。同学们需要多加练习哦!

　　查看全部：托福阅读题型分类练习之修辞目的题

　　托福阅读修辞目的题：Minerals and Plants

　　【Paragraph 6】Only recently have investigators considered using these plants to clean up soil and waste sites that have been contaminated by toxic levels of heavy metals–an environmentally friendly approach known as　phytoremediation. This scenario begins with the planting of hyperaccumulating species in the target area, such as an　abandoned mine or an irrigation pond contaminated by runoff. Toxic minerals would first be absorbed by roots but later　relocated to the stem and leaves. A harvest of the shoots would remove the toxic compounds off site to be burned or　composted to recover the metal for industrial uses. After several years of cultivation and harvest, the site would berestored at a cost much lower than the price of excavation and reburial, the standard practice for remediation of　contaminated soils. For examples, in field trials, the plant alpine pennycress removed zinc and cadmium from soils near　a zinc smelter, and Indian mustard, native to Pakistan and India, has been effective in reducing levels of selenium salts　by 50 percent in contaminated soils.(Minerals and Plants)

　　Why does the author mention “Indian mustard”?

　　○ To warn about possible risks involved in phytoremediation

　　○ To help illustrate the potential of phytoremediation

　　○ To show that hyperaccumulating plants grow in many regions of the world

　　○ To explain how zinc contamination can be reduced

　　答案见下一页：

本文关键字: 托福阅读题型 托福阅读训练 修辞目的题

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