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托福阅读例文翻译解析：矿物质和植物

2015-01-15 17:39:34来源：网络

hyperaccumulating species in the target area, such as an abandoned mine or an irrigation pondcontaminated by runoff. Toxic minerals would first be absorbed by roots but later relocatedto the stem and leaves. A harvest of the shoots would remove the toxic compounds off siteto be burned or composted to recover the metal for industrial uses. After several years ofcultivation and harvest, the site would be restored at a cost much lower than the price ofexcavation and reburial, the standard practice for remediation of contaminated soils. Forexamples, in field trials, the plant alpine pennycress removed zinc and cadmium from soils neara zinc smelter, and Indian mustard, native to Pakistan and India, has been effective in reducinglevels of selenium salts by 50 percent in contaminated soils.

　　Which of the sentences below best expresses the essential information in the highlightedsentence in the passage? Incorrect choices change the meaning in important ways or leave outessential information.

　　Before considering phytoremediation, hyper accumulating species of plants local to the targetarea must be identified.

　　The investigation begins with an evaluation of toxic sites in the target area to determine theextent of contamination.

　　The first step in phytoremediation is the planting of hyper accumulating plants in the area to becleaned up.

　　Mines and irrigation ponds can be kept from becoming contaminated by planting hyperaccumulating species in targeted areas.

　　It can be inferred from Paragraph6 that compared with standard practices for remediation ofcontaminated soils, phytoremediation

　　does not allow for the use of the removed minerals for industrial purposes.

　　can be faster to implement

　　is equally friendly to the environment

　　is less suitable for soils that need to be used within a short period of time.

　　Why does the author mention Indian mustard?

　　To warn about possible risks involved in phytoremediation

　　To help illustrate the potential of phytoremediation


本文关键字: 托福阅读例文翻译解析 矿物质和植物

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