2. 外语
  3. Magnetic field is an earth phenomenon that ______. What does the word "flip" (Line 6, Para. 2) mostly probably mean?

Magnetic field is an earth phenomenon that ______. What does the word "flip" (Line 6, Para. 2) mostly probably mean?

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问题 Magnetic field is an earth phenomenon that ______.
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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