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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

　　The word suspended in the passage is closest in meaning to

　　grown

　　protected

　　spread out

　　hung

　　Paragraph5: Scientists have known for some time that certain plants, called hyperaccumulators, can concentrate minerals at levels a hundredfold or greater than normal. Asurvey of known hyper accumulators identified that 75 percent of them amassed nickel,cobalt, copper, zinc, manganese, lead, and cadmium are other minerals of choice. Hyperaccumulators run the entire range of the plant world. They may be herbs, shrubs, or trees.Many members of the mustard family, spurge family, legume family, and grass family are tophyper accumulators. Many are found in tropical and subtropical areas of the world, whereaccumulation of high concentrations of metals may afford some protection against plant-eating insects and microbial pathogens.

　　Why does the author mention herbs, shrubs, and trees?

　　To provide examples of plant types that cannot tolerate high levels of harmful minerals.

　　To show why so many plants are hyper accumulators.

　　To help explain why hyper accumulators can be found in so many different places.

　　To emphasize that hyper accumulators occur in a wide range of plant types.

　　The word afford in the passage is closest in meaning to

　　offer

　　prevent

　　increase

　　remove

　　Paragraph 6: Only recently have investigators considered using these plants to clean up soil andwaste sites that have been contaminated by toxic levels of heavy metals – an environmentallyfriendly approach known as phytoremediation. This scenario begins with the planting of

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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