题目内容：
When we sleep is__________cultural as biological and practices differ greatly round the globe． 
参考答案：
答案解析：
单选题：When we sleep is__________cultural as biological and practic
- 题目分类：英语
- 题目类型：单选题
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[A] asset [B] bill [C] account[D] loan
[A] asset [B] bill [C] account[D] loan
请在（38）处填上最佳答案。
请在（38）处填上最佳答案。
74.
74. A．pressure B．restraint C．load D．weight
72.
72. A．extension B．raise C．addition D．growth
31.
31. A．They may have to continue to work in old ag B．They may regret the time the