问题 单项选择题

关于CA安全认证体系的叙述中错误的是______。

A.CA安全认证中心负责所有实体证书的签名和分发

B.CA机构的数字签名使得攻击者不能伪造和篡改证书

C.CA安全认证中心以磁盘或智能IC卡的形式向用户发放证书

D.CA安全认证中心进行在线销售和在线谈判,处理用户的订单

答案

参考答案:D

解析:[知识点] CA安全认证体系
[评析] 为了保证交易的安全顺利进行,参加商务活动的双方需要确认对方身份,由CA安全认证中心发放的证书是电子商务中最常用的认证方法。CA安全认证中心负责所有实体证书的签名和分发。证书是经过授权中心数字签名的,因此攻击者不能伪造和篡改证书。需要申请证书的用户可以向CA安全认证中心提出申请。经过审核后,CA安全认证中心以磁盘或智能IC卡的形式向用户发放证书。

完形填空

第三节 完形填空(共20小题,每小题1.5分,满分 30分)

从A、B、C、D中选出最佳选项:

As the pace of life continues to increase, we are fast losing the art of relaxation. 21  you are in the habit of rushing through life, being on the go from morning till night, it is hard to  22   down. But relaxation is  23   for a healthy mind and body.

Stress is a  24   part of everyday life and there is no way to  25  it. In fact, it is not the bad thing that it is often supposed to be. A  26  amount of stress is important to provide motivation and give  27  to life. It is only when the stress gets out of control  28  it can lead to poor performance and  29  health.

The amount of stress a person can bear  30  very much on the individual. Some people are not afraid of stress, and such  31  are obviously chief material for managerial.(管理的) responsibilities. Other people lose heart at first  32  of unusual difficulties. When exposed to stress, in  33 form , we react both physically and mentally. In fact we make a choice between “34  and fight”. And in more ancient days the choices made the  35  between life and death. The crisis we meet today are  36  to be so extreme, but however little the stress is, it requires the same response. It is when such a reaction  37  a long time, through continued exposure to stress, that health becomes  38  . Such serious conditions as high blood pressure and heart disease have established links with stress. 39  we cannot remove stress from our lives, we need to find ways to deal with it.

So what do you think of  40  ? What is your way to deal with it?

21.A.When           B.While               C.Once              D.As

22.A.slow             B.calm                 C.get                 D.turn

23.A.unnecessary     B.satisfied            C.useful             D.necessary

24.A.physical        B.natural              C.hard               D.terrible

25.A.tolerate         B.solve                C.avoid              D.accept

26.A.sure              B.certain              C.large               D.great

27.A.purpose         B.resource            C.influence         D.instruction

28.A.when           B.why                 C.that                D.how

29.A.ill                 B.good                C.strong             D.weak

30.A.insists           B.depends            C.calls               D.spends

31.A.patterns         B.personalities      C.situations        D.characters

32.A.glance           B.view                 C.sight               D.impression

33.A.whichever     B.whatever           C.however          D.whenever

34.A.peace            B.fright               C.pressure          D.heaviness

35.A.decision        B.promise            C.difference       D.choice

36.A.unlikely        B.likely               C.necessary        D.probable

37.A.continues      B.lives                 C.stands             D.lasts

38.A.balanced       B.injured             C.endangered      D.changeable

39.A.Unless          B.Since                C.Because          D.As

40.A.stress            B.relaxation         C.ways               D.exposure

多项选择题