专四

单选题According to the passage, vitamin-deficiency diseases were caused by

参考答案：B进入在线模考
细节判断题。考查维生素缺乏的原因，定位到第3段。根据第3段首句可知，补充维生素在20世纪早期开始流行，因为这个时候很多人都无法摄人多样化的水果和蔬菜，故选项8符合题意。

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