单选题
专四
2010-10-12
What is special about the belt discovered latest?
A．It is an insular belt which unexpectedly pierces through Saturnian ring
B．It is much smaller and less intense than the formerly-discovered belt
C．It is different from the Van Allen belts of Eart
D．It is the outermost belt of Satur
参考答案
B
答案解析
【定位】第5段。
【解析】细节题。原文第s段说：“发光带要小一些．粒子能量也不如土星主要发光带强。”故正确答案为B。
【点睛】选项A称该辐射带是孤立的，它出人意料地穿透了土星环；原文说到，辐射带的颗粒可以穿透土星环．二者并不一致，不选A。C本身没错，但说它与地球上的范·艾伦辐带不同，并未揭示该辐射带的特点，与题意不符。D错误，该辐射带在土星环内侧，远比土星的主要辐射带低。
【解析】细节题。原文第s段说：“发光带要小一些．粒子能量也不如土星主要发光带强。”故正确答案为B。
【点睛】选项A称该辐射带是孤立的，它出人意料地穿透了土星环；原文说到，辐射带的颗粒可以穿透土星环．二者并不一致，不选A。C本身没错，但说它与地球上的范·艾伦辐带不同，并未揭示该辐射带的特点，与题意不符。D错误，该辐射带在土星环内侧，远比土星的主要辐射带低。
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