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  3. 资料：A high-precision NASA radar instrumen

资料：A high-precision NASA radar instrumen

免费题库2022-08-02  19
问题 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.What does the underlined word permanent （paragragh 2） mean?A.Freeze easily.B.Move quickly.C.Long-lasting.D.Extremely cold.
选项 A.Freeze easily.
B.Move quickly.
C.Long-lasting.
D.Extremely cold.
答案 C
解析 本题考查的是细节理解。
【关键词】permanent; mean
【主题句】第2自然段The ice caps — large areas of permanent snow and ice cover — encompass multiple glaciers flowing in different directions and at different speeds. 冰盖——大面积的永久冰雪覆盖区域，包含多个冰川在不同方向，以不同的速度流动。
【解析】本题的问题是“第二自然段中划线的词‘permanent’是什么意思？”。A选项意为“容易结冰”；B选项意为“移动迅速”；C选项意为“持续的，长期的”；D选项意为“极其冷的”。根据主题句可知，permanent意为“长期的”，故选C。
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