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托福阅读修辞目的题：Green Icebergs

2015-08-12 16:51:05来源：网络

　　【托福阅读题型：Green Icebergs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：Green Icebergs

　　【Paragraph 5】A green iceberg that stranded just west of the Amery Ice Shelf showed two distinct layers: bubbly　blue-white ice and bubble-free green ice separated by a one-meter-long ice layer containing sediments. The green ice　portion was textured by seawater erosion. Where cracks were present, the color was light green because of light　scattering; where no cracks were present, the color was dark green. No air bubbles were present in the green ice,　suggesting that the ice was not formed from the compression of snow but instead from the freezing of seawater. Large　concentrations of single-celled organisms with green pigments (coloring substances) occur along the edges of the ice　　shelves in this region, and the seawater is rich in their decomposing organic material. The green iceberg did not contain　large amounts of particles from these organisms, but the ice had accumulated dissolved organic matter from the　seawater. It appears that unlike salt, dissolved organic substances are not excluded from the ice in the freezing process.　Analysis shows that the dissolved organic material absorbs enough blue wavelengths from solar light to make the ice　appear green.(Green Icebergs)

　　Why does the author mention that “The green ice portion was textured by seawater erosion”?

　　○To explain why cracks in the iceberg appeared light green instead of dark green

　　○To suggest that green ice is more easily eroded by seawater than white ice is

　　○To support the idea that the green ice had been the bottom layer before capsizing

　　○To explain how the air bubbles had been removed from the green ice

　　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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