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  3. Which of the following is a CORRECT definition of a phone?

Which of the following is a CORRECT definition of a phone?

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问题 Which of the following is a CORRECT definition of a phone?
选项 A、It is a phonological unit.
B、It is a speech sound.
C、It is an abstract sound feature.
D、It is an actual realization of a phoneme.
答案B
解析 音素是语音学研究的基础单位，是具体的语音(speech sound)。音位(phoneme)才是音系学的单位(phonological unit)，且音位是抽象语音单位(abstract sound feature)，故A、C错误。音位在不同语音环境中的具体形式称为“音位变体”(allophone)，故D错误。
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