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【简答题】
SECTION BPASSAGES In this section you will hear several passages. Listen to the passages carefully and then answer the questions that follow. Questions 11 to 13 are based on the following passage .At the end o f the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. What were the scientists worried about soon after the Gulf War? [A] The threat of poisonous desert animals and plants. [B] The exhaustion of energy resources. [C] The destruction of oil wells. [D] The spread of the black powder from the fires.
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【单选题】She wondered if she could have the opportunity to spend here so that she could learn more about the city .
A.
sometimes
B.
some time
C.
sometime
D.
some times
【单选题】在下列描述中，对SNMP协议理解错误的是(57)。
A.
SNMP为应用层协议，是TCP/IP协议族的一部分
B.
SNMP的各个版本中，所有数据都以明文形式发送
C.
如果没有用SNMP来管理网络，那就没有必要运行它
D.
SNMP协议使用公开端口是UDP端口161和162
【单选题】n ____ she wondered if she had made a mistake.
A.
Not until long afterwards that
B.
Not long until afterwards
C.
It was not until long afterwards that
D.
It was long afterwards until
【单选题】现有的互联网是在IPv4协议的基础上运行的。IPv6是下一版本的互联网协议,也可以说是下一代互联网的协议,下列关于IPv6相较于IPv4的优势的说法中错误的是:( )
A.
IPv6具有更大的地址空间,能显著解决IP地址不足的问题
B.
IPv6使用更长的路由表 ,转发数据包的速度下降
C.
IPv6具有更高的安全性,使用IPv6网络中用户可以对网络层的数据进行加密并对IP报文进行校验
D.
IPv6增加了增强的组播(Multicast)支持以及对流的支持(Flow Control),这使得网络上的多媒体应用有了长足发展的机会
【简答题】_____________ she wondered if she had made a mistake. [A] Not until long afterwards that [B] Not long until afterwards [C] It was not until long afterwards that [D] It was long afterwards until
【单选题】在下列描述中，对SNMP协议理解错误的是（ ）。
A.
SNMP为应用层协议，是TCP/IP协议簇的一部分
B.
SNMP的各个版本中，所有数据都以明文形式发送
C.
如果没有用SN MP来管理网络，那就没有必要运行它
D.
SNMP协议使用公开端口是UDP端口161和162
【单选题】_____ she wondered if she had made a mistake.
A.
Not until long afterwards that
B.
It was not until long afterwards that
C.
Not long until afterwards
D.
It was long afterwards until
【单选题】以下有关电子的叙述中不正确的是
A.
可以定时发送邮件
B.
接收到的邮件不能转发给他人
C.
用户可以设置邮件的自动接收和回复
D.
接收到的邮件可以长期存放在邮件服务器
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