2. 外语
  3. This passage is adapted from material published in 2002. In 1971, hot on the heels of plate-tectonic theory’s acceptance, J.

This passage is adapted from material published in 2002. In 1971, hot on the heels of plate-tectonic theory’s acceptance, J.

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问题     This passage is adapted from material published in 2002.
    In 1971, hot on the heels of plate-tectonic theory’s acceptance, J. W. Morgan suggested that hotspots—areas of intense volcanism such as Hawaii, Yellowstone, and Iceland—are fueled by plumes of hot material arising in the deep mantle and punching through the mobile shallow mantle and crust to the surface. Morgan’s theory was developed to explain the time-progressive trails of volcanoes associated with some hotspots and the hotspots’ apparent fixity relative to one another. If the sources of the volcanism were rooted in the immobile deep mantle, they would not move relative to one another and the plates at the surface would drift above, bearing away trails of volcanism. According to a recent article by geologist G. R. Foulger, however, although hotspots do exist, they do not have time-progressive volcanic trails and are not fixed relative to one another.
Which of the following best describes the function of the highlighted sentence?
选项 A、It points out some unintended consequences of a theory.
B、It elucidates the thinking behind Morgan’s suggestion.
C、It explains why the theory of plate tectonics had been accepted
D、It expresses the author ’s attitude toward Morgan’s suggestion.
E、It introduces an alternative to Morgan’s suggested explanation.
答案B
解析 本题属于功能题，定位句3s版本便是摩根的理论背后的机理，因此选项B正确。A项定位句是支持摩根理论的，不可能用于指出其错误结果。C项文中未提及。D项没提作者观点。E项驳论文，没有替代性解释。
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