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题目材料：

Glaciologists have conjectured that increasing temperatures and decreasing precipitation caused the rapid observed retreat of glaciers throughout the European Alps after the mid-nineteenth century. However, such scenarios are inconsistent with temperature records and climate proxies. During the latter half of the nineteenth century through the early twentieth century, when glaciers were retreating rapidly, temperatures in the Alpine region were apparently cooler than in the late eighteenth to early nineteenth centuries, and precipitation was largely unchanged. Glaciers subject to these climatic conditions alone should have advanced instead of retreated. One possible explanation is the dramatic rise of industrial black carbon in the mid-nineteenth century. Black carbon deposits could have increased the absorption of solar radiation by snow, generally increasing glacier melt and resulting in glacier retreat.

Which of the following best describes the function of the first sentence in the context of the passage as a whole?

A.It highlights factors that contributed to the phenomenon on which the passage focuses.
B.It anticipates an objection to a method that the passage subsequently explains.
C.It recapitulates an outdated view that the passage argues is nevertheless instructive.
D.It summarizes a hypothesis that the passage subsequently disputes.
E.It makes a generalization that the passage shows to be valid only under certain conditions.

D显示答案

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