药物性牙龈增生的临床表现

A．波及全口牙，以上下前牙区较重

B．曾生范围可由边缘龈到附着龈

C．龈质地坚韧有弹性

D．牙龈呈球形，结状性增生

E．以上都是

Melissa and LoveLetter made use of the trust that exists between friends or colleagues. Imagine receiving an (56) from a friend who asks you to open it. This is what happens with Melissa and several other similar Email (57) . Upon running, such worms usually proceed to send themselves out to Email addresses from the victim’s address book, previous Emails, Web pages (58)
As administrators seek to block dangerous Email attachments through the recognition of well-known (59) , virus writers use other extensions to circumvent such protection. Executable (.exe) files are renamed to .bat and .cmd plus a whole list of other extensions and will still run and successfully infect target users.
Frequently, hackers try to penetrate networks by sending an attachment that looks like a flash movie, which, while displaying some cute animation, simultaneously runs commands in the background to steal your passwords and give the (60) access to your network.

A．attachment

B．packet

C．datagram

D．message