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【单选题】
()是指通过计算机网络非法进入他人系统的计算机入侵者。他们对计算机技术和网络技术非常精通,能够了解系统的漏洞及其原因所在,通过非法闯入计算机网络来窃取机密信息,毁坏某个信息系统。
【多选题】
根据计算机在控制中的应用方式,把计算机控制系统分为()、()、()和()
【判断题】
计算机并不是管理信息系统的必要条件,有了管理就有了管理信息系统。从原理上讲,可以抛开计算机从概念上讨论管理信息系统。
【单选题】
计算机网络是用通信线路将分散在不同地点并具有独立功能的多台( )互相连接,按照网络协议进行数据通信,实现资源共享的信息系统。
【多选题】
计算机信息系统环境下审计风险的类型包括?
【单选题】
计算机网络系统是由通信子网和( )子网组成的。
【单选题】
抛掷一枚均匀硬币,直到出现3次正面才停止,则正好在第六次停止的概率为
【判断题】
答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”At the early nineteen century, people did not use stamps.
【判断题】
答题说明:句子没有语法错误请选择“正确”,有语法错误请选择“错误”There is a various of programs that one can see on every channel.
【多选题】
On May 6, 1840, post offices___________ England began to sell stamps.
【单选题】
Television is a remarkable_________ !
【单选题】
You can buy things_________ special low prices when department stores have sales.
【单选题】
阅读理解:阅读下列短文,回答文后问题,选择最佳答案Trees mainly serve man in three important ways: They provide him with wood and other products; they provide him shade; and they help to prevent droughts and floods.Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important.In his eagerness to make money from trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had. And besides, he is usually too careless to plant and look after new trees. So the forests slowly disappear.This does not only mean that man will have fewer trees. The results are even more serious: for where there are trees, their roots break up soil allowing the rain to sink in and also bind(固定) the soil, thus preventing it from being washed away easily;but where there are no trees, the rain falls on hard ground and flows away, causing floods and carrying away the rich top-soil. When the top-soil is gone, nothing remains but worthless desert.Two thousand years ago,a rich and powerful country cut down its trees to build warships, with which to gain itself an empire.It set up the empire, but, without its trees, its soil became poor and grew weak. When the empire fell to pieces, the home country found itself faced by floods and starvation(饥荒).2. In many places forests slowly disappear because __________.
①
A. many trees have been cut down by man
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B. new trees are not well looked after
③
C. man has not paid enough attention to planting trees
【单选题】
_________ people have a photographic memory.
【单选题】
Rowland Hill was the first to_________ a proposal to use stamps.
【单选题】
Why has jogging become so popular? Because jogging is a very_________ exercise.