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 El Nino develops.
D、show the recent observations of scientists.

答案B

解析
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