The writer begins the text with Paragraphs 2 and 3 are written to

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问题 The writer begins the text with
Paragraphs 2 and 3 are written to

选项 A、discuss the causes of climatic irregularities.
B、exemplify the abnormal effects of EI Nino.
C、explain the way in which EI Nino develops.
D、show the recent observations of scientists.

答案B

解析
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