______, we should sleep at sleep at leas...

______, we should sleep at sleep at least 8 hours a day, but in practice we sleep less than that.

A. In fact B. In theory

C. On average D. In particular

B 【解析】A选项意为“实际上，事实上”；B选项意为“从理论上讲”；C选项意为“平均”；D选项意为“特别，特殊”。句意：从理论上来讲，我们每天至少应该睡八个小时，但实际上我们的睡眠时间并没有八小时。与in practice相对是In theory，故本题选B项。

考点分析：

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