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托福阅读修辞目的题:Geology and Landscape

2015-08-11 15:20:58来源:网络

  【托福阅读题型:Geology and Landscape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:Geology and Landscape

  【Paragraph 5】The weather, in its many forms, is the main agent of erosion. Rain washes away loose soil and penetrates cracks in the rocks. Carbon dioxide in the air reacts with the rainwater, forming a weak acid (carbonic aci○ that may chemically attack the rocks. The rain seeps underground and the water may reappear later as springs. These springs are the sources of streams and rivers, which cut through the rocks and carry away debris from the mountains to the lowlands.(Geology and Landscape)

  Why does the author mention Carbon dioxide in the passage?

  ○To explain the origin of a chemical that can erode rocks

  ○To contrast carbon dioxide with carbonic acid

  ○To give an example of how rainwater penetrates soil

  ○To argue for the desirability of preventing erosion

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