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  3. Magnetic field is an earth phenomenon that ______. [br] What does the word "flip

Magnetic field is an earth phenomenon that ______. [br] What does the word "flip

游客2023-08-01  17
问题 Magnetic field is an earth phenomenon that ______. [br] What does the word "flip" (Line 6, Para. 2) mostly probably mean?
选项 A、It means to "decline".
B、It means to "fluctuate".
C、It means to "intensify".
D、it means to "reverse".
答案 D
解析 本题问“flip 这个词在文中最有可能是什么意思?”第二段最后说当两极变化的时候，磁场重新获得能量，这一过程不断反复。第一段第二句也谈到，It fluctuates in strength，drifts from its axis，and every few 100，000 years undergoes a dramatic polarity reversal-- a period when north pole becomes south pole and south pole becomes north pole. 也就是说地球磁场经历剧烈反转，南北极交换。故[D]“颠倒；反转；翻转”正确。[A]“下倾，下降，下垂”。前文中说磁场的强度下降而不是磁极下降。[D]“加强，强化”。作者没有说磁极加强，所以不正确。[C]“变动，波动，涨落，上下，动摇”。波动也应该与磁场强度搭配，本项也不正确。
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