题目内容
Our Chinese teacher didn't go to bed______ he finished his work last night．
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It's a good habit to wash your hands ________ you have meals．
下列软件中，属于操作系统的软件是（ ）
1. Agriculture occupies an important place in the _________ economy.2. Olympics is the biggest sports _______ in the world.3.I was sad because I felt that the splendid years of my ________ childhood had come to an end.4.The conference might reconvene (重新召开)after its opening ________ .5.The government has promised a/an _______￡1 billion for health care.
假设一个主机的IP地址为192.168.5.121，而子网掩码为255.255.255.248，那么该IP地址的网络号为多少？主机号为多少？
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