公鑰體系中，私鑰用于  （1）  ，公鑰用于  （2）  。
（1）A、解密和簽名
B、加密和簽名
C、解密和認(rèn)證
D、加密和認(rèn)證
（2）A、解密和簽名
B、加密和簽名
C、解密和認(rèn)證
D、加密和認(rèn)證

HTTP 協(xié)議中，用于讀取一個網(wǎng)頁的操作方法為  （ ）  。
A、READ
B、GET
C、HEAD
D、POST

幀中繼作為一種遠(yuǎn)程接入方式有許多優(yōu)點，下面的選項中錯誤的是  （ ）  。
A、幀中繼比 X.25 的通信開銷少，傳輸速度更快
B、幀中繼與 DDN 相比，能以更靈活的方式支持突發(fā)式通信
C、幀中繼比異步傳輸模式能提供更高的數(shù)據(jù)速率
D、租用幀中繼虛電路比租用 DDN 專線的費(fèi)用低

People  are  i ndulging  in  an  illusion  whenever  t hey  find  themselves  explaining  at  a cocktail(雞尾酒)  party,  say,  that  they  are  "i n  computers,"  or  "in  telecommunications,"  or  "in electronic  funds  transfer".  The  implication  is  that  they  are  part  of  the  high-tech  world.  Just between  us,  they usually  aren't.  The researchers  who made fundamental breakthroughs in  those areas are in a high-tech busi ness. The rest of us are  （1）  of their work. We use computers and other new t echnology  components to  develop  our  products  or  to  organize our  affairs.  Because we  go about  this work  in teams and projects and other tightly knit  working  groups(緊密聯(lián)系在一起的工作小組),  we  are  mostl y  in  the  human  communication  business.  Our  successes  stem
from  good human  int eractions  by  all  participants in  the effort,  and our  failures  stem  from  poor human interactions.
The main reason we tend to focus on t he  （2）  rather t han the human side of the work is
not because it's more  （3）  , but because it's easier to do. Getting the new disk drive installed is positively trivial compared t o figuring out why Horace is in a blue funk(恐懼) or why Susan is dissatisfied with the company after only a few months. Human  interactions are complicated and never  very  crisp(干脆的,干凈利落的) and  clean in  their effects, but they  matter  more  than any other aspect of the work.
If you find yourself concentrating on the  （4）  rather than the  （5）, you're like t he
vaudeville character(雜耍人物)  who loses  his  keys  on  a  dark  street and  looks  for  them  on t he adjacent street because, as he explains, "The light is better there!".
（1）A、creators
B、innovators
C、appliers
D、inventors
（2）A、technical
B、classical
C、social
D、societal
（3）A、trivial
B、crucial
C、minor
D、insignificant
（4）A、technology
B、sociology
C、physiology
D、astronomy
（5）A、technology
B、sociology
C、physiology
D、astronomy