Which of the following titles is most appropriate to the passage? The word "flip" (Pare. 2) most probably means______.

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问题 Which of the following titles is most appropriate to the passage?
The word "flip" (Pare. 2) most probably means______.

选项 A、decline
B、intensify
C、fluctuate
D、reverse

答案D

解析 根据文章第二段:法国科学家的分析表明地球磁场强度的变化具有明显的节奏。尽管短期内磁场强度会发生不规则的变化,但每次两极转化之前似乎都不可避免地有一个长期的衰竭期。当两极转化时,地球磁场迅速地获得了能量并开始新一轮的循环。由此,根据上下文的意思可推断,poles flip就是指代前面的polarity reversal。flip指的就是两极的转化,由此可知,D项选择的意思与此项相符。
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