PASSAGE ONE [br] What does the word "so" refer to in Paragraph 4? Have no suffic

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问题 PASSAGE ONE [br] What does the word "so" refer to in Paragraph 4?

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答案 Have no sufficient Vitamin D.

解析 第四段中原句为“Half of all adults in Britain are estimated to suffer Vitamin D deficiency in the winter and spring—one in six severely so…. ”可见so是指代本句前半部分所说的维生素D缺乏现象。
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