如图是迄今世界上出土最大、最重的青铜器，享有“镇国之宝”的美誉。现为国家一级文物，2002年列入禁止出国（境）展览文物名单。它是（　　）

    If you have a mobile phone，the Internet could always be with you．And that is often a good thing．You can use the Internet for ____，learning and talking with your Mends．But the Internet can also be a ____place. The good news is that it really isn't too hard to protect (保护) ____．Following these tips will let you enjoy the Internet and keep you safe(安全的)．

    Take control of your personal information．First．don't ____too much online．For example，don't put your phone number or real ____on the Internet．Second，make sure you know who is ____your personal information．Don't let everyone see everything you put on the Internet．

    Be careful of strangers(陌生人)．It can be fun to meet interesting and ____people on the Internet，but be careful．Some children have found themselves in a dangerous situation ____they agreed to meet online friends in real life．

    Use your time online to make the Internet a better place. Don't say things that will ____other people．Don't send rude(粗鲁的) ____．And delete people who are often rude．