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托福阅读修辞目的题：Minerals and Plants

2015-08-11 15:28:34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 5】Scientists have known for some time that certain plants, called hyperaccumulators, can concentrate　minerals at levels a hundredfold or greater than normal. A survey of known hyperaccumulators 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 top hyperaccumulators. Many are found in tropical　and subtropical areas of the world, where accumulation of high concentrations of metals may afford some protection　against plant-eating insects and microbial pathogens.(Minerals and Plants)

　　8. 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 hyperaccumulators.

　　○ To help explain why hyperaccumulators can be found in so many different places.

　　○ To emphasize that hyperaccumulators occur in a wide range of plant types.

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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