What is being practised if a teacher asks students to read words like "cot, hot" and "dog, log"?
解析：
本题考查语音教学。最小对立体，也称最小对立对，指除了出现在同一个位置上的一个音之外其余都相同的两个语音组合。题目中的cot与hot，dog与log两组词都只有一个音素的差别，因此该教师让学生练习的是最小对立体。故本题选C。
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