单选题：What does a hearing disorder belong to?[A] External noise.[B

题目内容：

What does a hearing disorder belong to?
[A] External noise.
[B] Physiological noise.
[C] The effect of cold.
[D] Psychological noise.

参考答案：

答案解析：

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A) In a restaurant. B) In a shop. 　　 C) At a market. D) In a bookstore.

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