With PGP， which of the following entity signs a users’s public key？（）

A . HTTP B . IP multicast C . TCP flows with dynamically assigned port numbers D . non-UDP protocol

A . Switch（config-if）#spanning-tree guard root B . Switch（config-if）#spanning-tree portfast C . Switch（config-if）#switchport mode trunk D . Switch（config-if）#switchport mode acce

A . ping B . Telnet C . FTP D . TCP E . IP

A . Statically defined RP B . Bootstrap Router C . Auto-RP D . RP Discovery Protocol（RDP） E . RP Helios F . RPARP（RARP）

A .  copy as backup B .  backup as copy C .  backup D .  copy

A . The route is learne d from an eBGP peer B . The route has no more than three ASNs in the AS_PatH C . The route is the best route for this prefix D . None of these facts can be positively determined by this output

A . ping B . Telnet C . FTP D . TCP E . IP

A．Economics course misleads students with false financial concepts. B．Students shouldn"t be encouraged to participate in the debt market. C．The high schools should stop teaching introductory economics. D．Only with more rational design can economics course be helpful.

A．Thinking is a social phenomenon. B．Thinking is solely a brain function. C．Thinking is a function of the nervous system. D．Thinking is the sum total of bodily activity.

A．George W. Bush. B．U.S. Supreme Court. C．Hillary Clinton. D．Equal Employment Opportunity Commission.

A. B. C. D.

A．Upgrades B．Maintenance C．Personal checks D．Unlimited use of the facilities

A．Advertising is responsible for compulsive shopping disorder. B．Pharmaceutical companies counteract the effects advertisers who persuade Americans to binge buy. C．Pharmaceutical companies are to blame for compulsive shopping disorder. D．Pharmaceutical companies are every bit as marketing-oriented as advertisers.

A．New usages should be forbidden in speech. B．Language change is fine, but shouldn"t be too much. C．Language change is inevitable but annoying. D．Changes in writing should keep in pace with speech.

A. signs B. gestures C. efficient D. body language

A．A person's instincts have little effect on his actions. B．Environment is important in determining a person's behavior. and personality. C．Biological reasons have a strong influence on how we act. D．The behaviorists' view correctly explains how we act.

A．The UN will vote on the retention of sanctions against Iraq. B．Most of us？tend？to？eat？far too much, which can lead to？fluid？retention. C．The？retention of？valued？employees？is？worth？more than a little？inconvenienc E． D．There was a slight retention in the departure of the plan E． 此题为多项选择题。

A、lick the boot B、grease the hand C、paint the apple D、clean the hand

A、My sister bought a lot of fruits for me,such as banana、orange、apple and pea B、We will go there,if it is fine tomorrow C、Why is he so happy today？ Because he has won the lottery D、He asked, “Where are you from？”