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    The safety of food has become one of the _________ problems in our daily life.

    A. more expensive B. more important

    C. most expensive D. most important

    D

    【解析】

    试题分析：句意：食品安全已经成为我们日常生活中最重要的问题之一。分析：考查固定句型：one of +形容词的最高级+可数名词复数。明确食品重要问题，因此第四项正确。故选 D

    考点：考查形容词的最高级。

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