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资料：A high-precision NASA radar instrument left a NASA airport in Southern California for Iceland on January 28 to create detailed maps of how glaciers move in the dead of winter. This will help scientists around the world better understand some of the most basic processes involved in melting glaciers, which are major contributors to rising sea levels.

NASA used the same airborne instrument in June 2012 to map the summer flows of two Icelandic ice caps. The ice caps — large areas of permanent snow and ice cover — encompass multiple glaciers flowing in different directions and at different speeds. By mapping the same ice caps now, in winter, when the surface remains frozen all day, and then comparing the winter and summer velocities, the researchers will be able to isolate the effects of melt water.

Above is a view of a small part of the Hofsjkull ice cap, which encompasses several glaciers. The fan at upper left is part of a glacier called Mlaj?kull.

For more on the research, see this NASA press release.

How can the scientists figure out the effects of melting water?

A.By melting the frozen iceberg in winter
B.By observing the snow's moving directions
C.By isolating ice from water in sunlines
D.By comparing the glaciers moving speeds

正确答案及解析

正确答案

解析

本题考查的是细节理解。

【关键词】how; the scientists; figure out effects; melting water

【主题句】第2自然段By mapping the same ice caps now, in winter, when the surface remains frozen all day, and then comparing the winter and summer velocities, the researchers will be able to isolate the effects of melt water. 通过勘察相同的冰盖，在冬天，当表面保持冷冻一整天，然后比较冬天和夏天的速度，研究人员将能够分离融水的影响。

【解析】本题的问题是“科学家们怎样才能弄清楚融化水的作用呢？”。选项A意为“通过冬天融化冰山”；选项B意为“通过观察雪的移动方向”；选项C意为“通过在太阳线下隔离水中的冰”；选项D意为“通过比较冰川的移动速度”。

根据主题句可知，科学家们通过对比冰川在夏天和冬天的移动速度来弄清楚融化水的作用，故选D。