词汇分类记忆 — 英语选择题

下列每组单词中，有一个与其他三个不同类，请找出。这三组中不同类单词分别是：第①组 cool, warm, hot, sunny；第②组 doctor, nurse, farmer, supermarket；第③组 walk, bus, train, subway。则这三个不同类单词依次对应的选项是：A. sunny, supermarket, walk B. cool, doctor, walk C. sunny, supermarket, bus D. cool, nurse, train