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  3. One characteristic of the El Nino is The passage functions as an

One characteristic of the El Nino is The passage functions as an

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问题 One characteristic of the El Nino is
The passage functions as an
选项 A、introduction to a new explanation of a physical phenomenon.
B、explanation of the difference between two related physical phenomena.
C、illustration of the limitations of applying mathematics to complicated physical phenomena.
D、indication of the direction that research into a particular physical phenomenon should take.
答案A
解析 篇章结构题。本文首句就提出了全文主旨：数学模型对厄尔尼诺现象(沿着南美洲太平洋沿岸发展而成的周期性海洋暖流)的新近预测显然是成功的，这一成功令研究者振奋。接下来，作者对这种模型进行了具体的解释说明。可见本文的篇章结构是对某种自然现象的新理论、新解释进行介绍。
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