5.根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
The rules of surfing the Internet
Do you obey the rules while surfing the Internet?
Your Security Is Your Problem
You know there are signs in every parking garage saying they're not responsible for lost or stolen items in your vehicle.（1）_______.
You're Speaking in a Public Forum（论坛）
Everything you post online is equal to posting it on the front page of the newspaper and delivering it to everyone around you. Some people may agree, and some may disagree. You may even strike a chord（引起共鸣） with enough people to start a movement. （2）_______.Only say online what you're willing to say in front of your grandma.
（3）_______.
The content of your posts matters, but so does where you're posting. The audience of a particular website may not agree with your particular message (or at least with the way you're presenting it), so be careful what you post where.
Keep It Civil
Freedom of speech is important——everyone should have the right to say what they want, and a few people who abuse this freedom can't affect anyone. （4）_______. This doesn't mean there aren't consequences to your words, however, so do with caution. Put forth the effort to be polite whether online or off.
You Should Be Anonymous
Anonymity（匿名）sounds like what some crazy hacker groups fill, but it's not. （5）_______.The reason why we all support Anonymity is that we believe every human being deserves the basic human right of being anonymous. You should be anonymous too.
A．You can say whatever you want.
B．Whether You Agree or Not, Majority Rules.
C．The Internet works the same way.
D．Anonymity is an ideal supported by grown and successful adults and inventors in every industry.
E．It's Not Just What You Post, but Where.
F．You'll never clean up the Internet, and it's not even worth trying.
G．You can't control what people do with your message, but you can control your message.
（1）C
（2）G
（3）E
（4）A
（5）D
（1）根据标题可知本段讲述的是网络安全问题，停车场的安全问题，那么网络也存在相同问题。故选C。
（2）根据空前边的内容“...Some people may agree, and some may disagree...”在网络上发表的言论，有人同意有人反对，甚至于组团发起一项运动，但是这都不是你能控制的，你能控制的只是自己所发表的信息。故选G。
（3）根据“The content of your posts matters, but so does where you're posting.”以及“so be careful what you post where”可知 E项正确。
（4）根据“Freedom of speech is important——everyone should have the right to say what they want, and a few people who abuse this freedom can't affect anyone”可知，你可以说你想说的。A项正确。
（5）根据“The reason we all support anonymity is that we believe every human being deserves the basic human right of being anonymity” 可知匿名是受人们支持的。故D项正确。