Tast 4 The following is a set of instructions about how to use credit
card．After reading it，you are required to complete the statements that follow
the questions(No．56 to No．60)．
A——attachment B——security certificate
C——carbon copy D——screen saver E——submit post
F——firewall G——log out
H——hacker I——Internet relay chat J——junk mail
K——remote login L——log on
M——site manager N——net worm O——online
shopping P——click rate Q——search engine ( )屏幕保护 ( )防火墙