escape from(Para. 1) can be substituted for From the third paragraph, besides shelter, the seawater is used as

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问题 escape from(Para. 1) can be substituted for
From the third paragraph, besides shelter, the seawater is used as

选项 A、detector.
B、sensor.
C、agent.
D、solvent.

答案C

解析 本题问从第三段可知,除屏蔽作用外,海水还起到什么作用。文章第三段介绍了DUMAND计划,其中海水有两个作用:一是屏蔽掉其他高能粒子(...shield them from the interfering effects of other high-energy particles...),二是用作反应物与中微子作用(...a neutrino interacts with a particle in an atom of seawater,...)。agent的意思是"反应物,试剂"。检测器:在实际检测过程中,首先是中微子与海水作用,然后被传感器探测到(...can be detected by the sensors)。即:海水+sensor=detector。传感器:在海底安放sensors,海水本身不是sensor。溶剂:solvent是"溶剂"的意思,虽然文中含糊地说海水是"detector medium",但实验者并没有把它作为溶剂去稀释中微子。
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