阅读理解。
      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。
     Here are some easy steps for you to stay safe and secure on the Internet.
        1   Never give out your full name , address and phone number, unless it is a safe site or it is
a well- known site.
     Protect your money. Do not give out your card information unless it is a secure site. You can
tell if the site is safe by looking at the lower part of your screen.    2  If it is locked, the site is secure.
"Unlocked" means that you should not give a card number.
     Don't believe "Get Rich Quick!" If it sounds too good to be true- it is! If you get an e-mail that
says you can make thousands of dollars in a few days, it isn't true. Most likely it will cost you in the
end.   3      
      A good virus scan(杀毒软件).Update your virus scan.   4   When you buy a virus scan, it may
have been on the shelves for months, so you need to update it frequently.
        5  Do not open e-mail attachments(附件)that are programs. Receiving these programs in e-mail
is harmless, but opening and running them can be dangerous.
A. There is a small lock.
B. Stay away from these offers!
C. New viruses come out daily.
D. There are always some unsafe sites.
E. Keep your main e-mail address private.
F. Don't give out personal information.
G. Protect yourself from dangerous e-mail viruses.