近年の経済成長により、都市部と地方の格差がますます___になってきた。
The correct answer is '顕著' (kencho), meaning 'remarkable' or 'striking.' It's used to describe something that is very obvious and easy to see, which fits the context of a widening gap. '明確' (meikaku) means 'clear' or 'distinct,' but '顕著' better emphasizes the degree and visibility of the difference. '重大' (juudai) means 'serious,' which describes the importance, not the visibility. '露骨' (rokotsu) means 'blatant' or 'unconcealed' and carries a negative connotation of being offensively obvious.
正解は「顕著(けんちょ)」です。はっきりと目立っている様子を意味し、格差が目に見えて大きくなってきたという文脈に合います。「明確(めいかく)」は「はっきりしている」という意味ですが、「顕著」の方が違いの程度が大きく、誰の目にも明らかであるというニュアンスが強いです。「重大(じゅうだい)」は事の重要性を表します。「露骨(ろこつ)」は感情などをあからさまに出す様を表し、ネガティブな意味合いで使われます。
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