最大密度曲线理论提出了一种理想的( )曲线。A．连续级配 B．间断级配 C．开级配

Internet use appears to cause a decline in psychological well-being, according to re search at Carnegie Mellon University. Even people who spent just a few hours a week on the Internet (47) more depression and loneliness than those who logged on less frequently, the two-year study showed. And it wasn’’t that people who were already feeling (48) spent more time on the Internet, but that using the Net (49) appeared to cause the bad feelings. Researchers are puzzling over the results, which were completely (50) to their expectations. They expected that the Net would prove socially (51) than television, since the Net allows users to choose their information and to communicate with others. The fact that Internet use reduces time (52) for family and friends may account for the drop in well-being, researchers hypothesized. Faceless, bodiless "virtual" (53) may be less psychologically satisfying than actual conversation, and the relationships formed through it may be shallower. Another possibility is that (54) to the wider world via the Net makes users less satisfied with their lives. "But it’’s important to (55) this is not a bout the technology itself; it’’s about how it is used," says psychologist Christine Riley of Intel, one of the study’’s sponsors. "It really (56) to the need for considering social factors in terms of how you design applications and services for technology."WORD BANKA) communication I) badB) meaningful J) pointsC) exposureK) availableD) agrees L) repeatedlyE) efficiency M) rememberF) contraryN) experiencedG) connection O) healthierH) actually

企业经营策略的中心是（）。

A.与开发商建立密切联系

B.必要的经济回报

C.树立良好的品牌形象和以积极的心态参与市场竞争

D.管理模式

由域名查询IP地址的过程分为递归查询和迭代查询两种，其中递归查询返回的结果为（17），而迭代查询返回的结果是（18）。

空白处（17）应选择（）

A.其他服务器的名字或地址

B.上级域名服务器的地址

C.域名所对应的IP地址或错误信息

D.中介域名服务器的地址

以社区为基础的病例-对照研究所选病例的优点是（）。

A.病例代表性好

B.混杂偏倚小

C.耗费人力物力少

D.产生回忆偏倚少

E.疾病诊断准确性好

对于CISCO路由器，存在两种访问路由器命令的方式是（）。

A、用户

B、客户

C、特权

D、匿名

E、管理员