2. 外语
  3. An introductory sentence to a brief summary of the passage is given below. Complete the summary by adding the THREE answer choic

An introductory sentence to a brief summary of the passage is given below. Complete the summary by adding the THREE answer choic

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问题 An introductory sentence to a brief summary of the passage is given below. Complete the summary by adding the THREE answer choices that express the most important ideas in the passage. Some answer choices do not belong in the summary because they express ideas that are not given in the passage or are minor ideas in the passage. This question is worth 2 points.
    The theory of continental drift was proposed in 1912 but not verified until nearly sixty years later, leading to the complementary theory of plate tectonics that forms the framework for geological study of the Earth.
    ____________
    ____________
    ____________
    Answer Choices
    1. Plates pulling away from each other at divergent boundaries cause new crust to form, splitting some surface land apart--such as Finland--and widening existing oceans.
    2. Though it seemed to match existing evidence, colleagues dismissed Alfred Wegener’s theory of continental drift because it did not satisfactorily explain how continents could move.
    3. Wegener based his theory on four major observations: the fit of South America and Africa; fossil, ice and rock similarities between those two continents; and dramatic differences in ancient and modern climates.
    4. In the 1950s, technological improvements in ocean floor mapping led to the discovery that sea floor spreading actually does cause almost unnoticeable but steady continental movement.
    5. Oceanic crust is being constantly recycled, created along submarine mid-ocean ridges and destroyed by descent into trenches along the rim of the Pacific Ocean basin.
    6. Further scientific investigation resulted in the discovery that giant land masses called plates are constantly moving and interacting, thus building and reshaping the face of the Earth.
选项
答案2，4，6
解析 文意总结题 题目要求找出有关大陆漂移说和板块构造论的主要内容。
    1．有关内容在第三段中进行了说明。“扩张边界会形成新的地壳”这一说法与原文相符，但是原文中的例子是冰岛，而不是芬兰。
    2．有关内容在第二段开始部分进行了说明。选项指出了魏格纳的大陆漂移说没有受到认可的最重要的理由，因此是主要内容。
    3．有关内容在第一段中进行了说明。这是魏格纳理论的基础，即四个观测结果，不是主要内容。
    4．有关内容在第二段中进行了说明。由于海底扩张导致大陆移动的重要事实的发现证明了魏格纳理论，因此这是主要内容。
    5．有关内容在第二段中进行了说明。海洋地壳产生和消失的过程是细枝末节的内容，不能算是主要内容。
    6．选项概括了在第三段中出现的板块构造论的要点，因此是主要内容。
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