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题目内容
（佳木斯大学语言治疗学）
What does the author say about people's sleeping habits
·They are culture－related.
·They affect people's health.
·They change with the seasons.
·They vary from persoto person.
·They are culture－related.
·They affect people's health.
·They change with the seasons.
·They vary from persoto person.
参考答案
