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。 This short story about friendship is very inspiring and tells you about true friendship． 1 ．
Long time ago in ancient Greece，there was a respected philosopher named Socrates who was highly knowledgeable．He was visited by a man one day． 2 ．Before he could even start talking about his friend，Socrates told him to take a test known as the Triple Filter Test （三重过滤考试）
3 ．Socrates asked him if the information he was going to tell him was true．The person said that he had just heard it on the way and was not sure if it was the absolute truth．The second filter was that of Goodness．He asked if the information was regarding anything good about his friend．The man said it was actually the opposite．The third filter was that of Usefulness．Socrates asked if the information was useful to him in any way． 4 ．
Socrates then replied that if any information regarding a friend was not true，good or useful，it shouldn’t be mentioned at all．Socrates was right．You may always talk about others without them being around，but when it comes to your friends it is just not worth it．You know your friends better than others． 5 ．
It only leads to strained relations and shows that you are not reliable or trustworthy as a friend．
A．The first test was the filter of Truth．
B．The man replied with a negative answer．
C．Socrates asked him to list his friend’s advantages．
D．So you must avoid talking behind the back of your friends．
E．Sometimes，sharing secrets will tell you more about the person．
F．It teaches a valuable lesson about friendship and how friends should be．
G．That person told Socrates he had something to tell him about his friend．