2. 外语
  3. The author refers to the ocean bottom as a "frontier" in Paragraph 1 because it ______. Deep-ocean sediments provided better in

The author refers to the ocean bottom as a "frontier" in Paragraph 1 because it ______. Deep-ocean sediments provided better in

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问题 The author refers to the ocean bottom as a "frontier" in Paragraph 1 because it ______.
Deep-ocean sediments provided better information about the world’s past climate because they ______.
选项 A、are well protected
B、have land-based evidence
C、are in isolation
D、have a longer history
答案A
解析 由题干中的Deep-ocean sediments provided better information about the world’s past climate定位到原文第四段第二句Deep-ocean sediments provide a climatic record stretching back hundreds of millions of years，because they are largely isolated from the mechanical erosion and the intense chemical and biological activity that rapidly destroy much land-based evidence of past climates．[精析] 原因目的题[考频：24]。第四段中because they are largely isolated from the mechanical erosion and the intense chemical and biological activity因为它们远离了机械侵蚀及生化活动的影响，这表明海底沉淀物很难受到侵蚀和破坏，从另一个角度也说明了它受到了很好的保护。故选A)。[避错] B)“有基于陆地的证据”，这点文中未提到，排除此项；C)“被隔离”，说得过于绝对，排除此项；D)“有更悠久的历史”，文章中未提到，排除D)。
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大学英语四级

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