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escape from(Para. 1) can be substituted for Which of the following is the most desirable site where cosmic neutrinos can be eas
escape from(Para. 1) can be substituted for Which of the following is the most desirable site where cosmic neutrinos can be eas
admin
2010-11-27
22
问题
escape from(Para. 1) can be substituted for
Which of the following is the most desirable site where cosmic neutrinos can be easily detected?
选项
A、Labs with massive detector,
B、Enclosed volcanic caves.
C、Vacuum cabins.
D、Shallow salt lake.
答案
B
解析
本题问下面哪个是简易检测宇宙中微子最理想的场所。文章二、三两段段末都出现了"shield"一词,说明在探测中微子时要屏蔽掉其他粒子的干扰,在DUMAND计划中,海水就是屏障物质。密封的火山洞与此相似,既然是火山洞,深度肯定没问题,而且岩石就是理想的屏蔽物,故"密封的火山洞"可作为检测中微子的场所。具有巨大检测器的实验室:其错误在于"labs"一词,虽然文章并没有说什么样的条件可以屏蔽干扰,但在 DUMAND计划中用的是5000米深的海水,可见这是一般实验室无法办到的。真空箱:vacuum是障眼法,排除此项的理由与前面所述相似。浅的咸水湖:文中用做屏蔽的海水深度是5000米,而比较浅的湖深度不够,无法屏蔽宇宙的其他粒子,因此不适合作为检测中微子的场所。
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0
考研英语一
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