问题 单项选择题

下列哪一个不是网络协议的要素

A.语法

B.语义

C.时态

D.时序

答案

参考答案:C

解析: 网络中的计算机之间为了能正确交换数据,必须遵守事先约定好的通信规则。这些规则明确规定了所交换数据的格式和时序,这些为网络数据交换而制定的规则、约定与标准被称为网络协议。一个网络协议主要有以下三部分构成,即语法、语义和时序。选项c不是网络协议的要素,因此本题的答案为C。

听力题

根据横线上的首字母提示或括号内的汉语提示完成句子。每空一词,请将答案写在答题卡上的规定位置。

小题1:In communication, a smile is usually a strong sign of a friendly and open a______________.

小题2:Do you have enough to c________ all your daily expenses?

小题3:We were a________________ to hear that she passed the test without much difficulty.

小题4:ThesceneryinSwitzerland, which is beyond d____________(描述), is attractive to the tourists from the whole world.

小题5:This July, a group of teaching ___________(志愿者) from Tsinghua University visited the school and launched the public service program entitled “The One Class” there.

小题6:Read the _________________(说明) carefully before you take the pills.

小题7:Peking duck is usually s__________ with steamed pancakes, which is used to wrap the meat and

slices of cucumber and shallots;

小题8:The number of foreign students studying in China has been ___________(增长) year by year.

小题9:Pandas are e____________ animals. There aren’t many of them left.

小题10:Manatees’ favorite ________________(栖息地) is the water under the trees in mangrove swamps.

小题11:Did you know that tea was invented by a________________?

小题12:Your views on education are _________ (相似的)to mine.

小题13:In Paris, it’s usually c_______________ to take the underground train to most places.

小题14:Take a deep breath and hold it in your chest. It can ___________(有效) control your anxiety.

小题15:If you pay some attention, you could easily point out some improper b_________ happening around: young men refusing to give seats to the old on buses; shoppers jamming into queue instead of waiting in line; rude riders neglecting red lights, etc.

单项选择题