问题 单项选择题

Internet是全球最大的、开放的、由众多网络互联而形成的计算机网络,狭义Internet是指由上述提到网络中采用IP协议的网络互联而成的,广义Internet是指狭义Internet加上所有 (92) 的网络。

Internet体系结构具有良好扩充性的主要原因在于它 (93) 。广义Internet的这种基于单一主干核心结构的弊端在于 (94) 。这种结构将逐渐被 (95) 所取代。

(93)处填()

A.基于树形结构,具有层次性和单向依赖性

B.基于客户机服务器结构,具有单向依赖性

C.基于星形结构,结点之间无依赖性

D.基于环形结构,结点之间无依赖性

答案

参考答案:A

完形填空

Ali is from a Middle Eastern country. He now stays in the USA. He smokes a lot of cigarettes(香烟) every day. He has smoked for nine years. Ali says, “ I tried to quit (放弃) smoking in my hometown, but it was impossible. My parents smoke. My brothers smoke. All my friends smoke. At parties and at meetings, almost all the men smoke. Here in the United States, many people don’t smoke.  ____小题1:____ ”

Many smokers are like Ali: they want to stop smoking.  ____小题2:____. They know it can cause cancer(癌症) and heart disease. But it is difficult for them to give up smoking because cigarettes have a drug in them. The drug is nicotine(尼古丁). People who smoke a lot need nicotine.

____小题3:____ Because the nicotine makes him uncomfortable. But in a few days, the smoker’s body is used to the nicotine, and he feels fine. Later, the smoker needs nicotine to keep feeling fine. Without nicotine, he feels bad.

____小题4:____ Many people who quit will soon smoke again. At a party or at work they will decide to smoke “just one” cigarette. Then they will smoke another cigarette, and another. Soon they become smokers again. How can we quit smoking? ____小题5:____     

A.It is very difficult to quit smoking.

B.So it will be easier to change the smoking habit here.

C.Thus it makes smokers addicted to cigarettes.

D.The smokers know that smoking is bad for their health.E. When a person first begins to smoke, he doesn’t feel good. 

F. Maybe there is only one easy way to quit smoking: never start. 

G. But it is said that medicine is needed to stop them from smoking.

口语交际,情景问答题