首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
公务员
Secret codes keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially whe
Secret codes keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially whe
admin
2019-05-22
68
问题
Secret codes keep messages private. Banks, companies, and government agencies use secret codes in doing business, especially when information is sent by computer.
People have used secret codes for thousands of years. 【K1】______ Code breaking never lags far behind code making. The science of creating and reading coded messages is called cryptography.
There are three main types of cryptography. 【K2】______For example, the first letters of " My elephant eats too many eels" spell out the hidden message " Meet me. "
【K3】______You might represent each letter with a number, for example. Let’s number the letters of the alphabet, in order, from 1 to 26. If we substitute a number for each letter, the message "Meet me" would read "13 5 5 20 13 5. "
A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 【K4】______ For example, "bridge" might stand for "meet" and "out" might stand for "me. " The message "Bridge out" would actually mean "Meet me. " 【K5】______ However, it is also hard to keep a code book secret for long. So codes must be changed frequently.
A. It is very hard to break a code without the code book.
B. In any language, some letters are used more than others.
C. Only people who know the keyword can read the message.
D. As long as there have been codes, people have tried to break them.
E. You can hide a message by having the first letters of each word spell it out.
F. With a code book, you might write down words that would stand for other words.
G. Another way to hide a message is to use symbols to stand for specific letters of the alphabet.
【K2】
选项
答案
E
解析
下一句话中的“for example”是明显的例证关系的逻辑词,据此推断此处应当是具体事例的理论表达。结合例证,选E。
转载请注明原文地址:https://kaotiyun.com/show/3JLq777K
本试题收录于:
小学英语题库教师公开招聘分类
0
小学英语
教师公开招聘
相关试题推荐
Nowsatellitesarehelpingtoforecasttheweather.Theyareinspace,andtheycanreachanypartoftheworld.Thesatellites
LastspringIwaswalkinginapark.Infrontofmetherewasamumandher3-year-olddaughter.Thelittlegirlwasholdingas
Nowsatellitesarehelpingtoforecasttheweather.Theyareinspace,andtheycanreachanypartoftheworld.Thesatellites
"Youcan’tbuyhappinessbutitlookslikeyoucanatleastinherit(遗传)it,"BritishandAustralianresearcherssaidonThursda
Throughouthistorymanhashadtoacceptthefactthatalllivingthingsmustdie.Butpeoplenowlivelongerthanthey【C1】_____
Believeyourself,______you’llgetthechance.
"Ifwinterscomes,canspringbefarbehind?"isawell-knownsentencecomesfrom______’spoem,OdetotheWestWind.
Igrewupseeinghandwrittennotesasthebestexpressionoflove.Mymomoften【C1】______small,squarepapersonthebedforme
Igrewupseeinghandwrittennotesasthebestexpressionoflove.Mymomoften【C1】______small,squarepapersonthebedforme
Unfortunately,hisgamblinganddrinkinghabitsmakehimavery______person.
随机试题
在学校中,“班级”与“学生”两个实体集之间的联系属于()关系。
我国现行宪法作为国家的根本法,既具有与一般法律相同的特点,又有与一般法律不同的特征。宪法的特征有
接地系统室外部分包括()。
下列项目中,按照《招标投标法》,不属于必须招标的工程建设项目范围的是( )。
公安机关在刑事诉讼中的任务是()。
计算
设f(x,y)为连续函数,则=().
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachofthenumb
Wheredidthemoviesbegin?ItisoftensaidthattheyareanAmericaninvention,andthisisnotentirelytree.Themotionpict
PassageOne
最新回复
(
0
)