A、Blue font. B、Return address. C、Capitalization. D、Obscene content. D在谈到filters时，男士提到含有以下几种内容的电邮可能会被过滤掉：包含某些大家心照不宣的敏感词语、红色或蓝色的大字

W: You have spoken to us about how we can prevent our e-mail address falling into the wrong hands. What can we do to alleviate the spam problem if this has already occurred, beyond creating a new account, which may not be practical for all of our listeners? Is there anything we can do to fight back against the spammers?
M: Sure. There are a variety of handy antispam tools out there on the market. Your ISP, that is, your Internet service provider, will most likely have one of the main antispam filters active on all their users’ accounts.
W: Hmmm, tell me about these filters. I think I need to get one.
M: Without going into too much technical detail, spam filter software will analyze all incoming messages and flag, divert or delete e-mails that it considers to be spam. This may be because the message contains certain words—I think we all know what types of words I’m talking about here. Or the e-mail may have other qualities which mark it out to be spam in all likelihood, such as large blue or red font, lack of return address, too much capitalization and a whole list of other considerations.
W: But doesn’t that mean we have to ask our friends never to write e-mails to us in blue? I would be very concerned about legitimate e-mails being deleted...
M: Oh, absolutely! An antispam filter will only flag an e-mail message as spam if several of these factors are found to be present in a particular message. If your friends choose to write to you in blue, but the message is otherwise perfectly normal, it will not be considered spam. These filters are great because users are often given control over the sensitivity level, but that’s not true if you use one of the huge national ISPs such as AOL
W: We now move on to an issue we mentioned at the beginning of the program—phishing. What is it and how can we best protect ourselves from it?
M: First of all, we should explain that even though the pronunciation is the same, this variety of phishing is spelt with a "PH" and not an "F". Right, phishing is quite a recent phenomenon but can be very damaging if users are not very aware of the dangers that exist. If you get an e-mail that claims to be from, let’s say, your bank and asks you to click on a link, visit a site and enter information such as your account number, password, or username, you can be certain that you have been a victim of phishing.
W: David, it’s been very informative to have you here speaking to us today. A little understanding of these issues can help us to see the world of e-mail and the Internet isn’t so sinister after all. Please come back and see us soon, won’t you?
M: I’d be delighted. Thanks very much for inviting me to speak to your listeners.
6. What can we learn from the beginning of this part’s interview?
7. According to David Akris, what is spam filter software?
8. What messages can be considered to be spam?
9. Which situation means you may have gotten into phishing?
10. What is David Akris’ focus in the interview?