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.
【K5】
选项
答案
A
解析
选项A和下一句话“However,it is also hard to…”呈意义上的递进关系。
转载请注明原文地址:https://kaotiyun.com/show/jJLq777K
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
《义务教育音乐课程标准》(2011年版)中“过程与方法”的具体内容为体验、模仿、探究、合作和综合。()
It’snoteasytobeanastronaut’sson.Everybodyexpectsyoutobespecialorperfect.Ioftenwonderhowmyfathereverhada
Onacoldwinterafternoon,Susanwaswalkinghomefromasupermarket.Shewasfeelingalittletired,asshewascarryinghers
It’sdifficult______thisworktoday.
Alittleboyinvitedhismothertoattend(出席)hiselementaryschool’sfirstteacher-parentmeeting.Tothelittleboy’sdismay,
Maryismybestfriend.We’reallfromHenan,46.______butnowIliveinBeijingwhenshelivesin47
Formanypeopletoday,readingisnolongerrelaxation.Tokeepuptheirworktheymustreadletters,reports,tradepublication
"Youcan’tbuyhappinessbutitlookslikeyoucanatleastinherit(遗传)it,"BritishandAustralianresearcherssaidonThursda
The______figurewasmadeofcoppersupportedbyametalframeworkwhichhadbeenespeciallyconstructedbyEiffel.
随机试题
交换理论认为人类的相互交往和社会联合是一种交换行为。其创立者是美国社会学家()
下列疾病中,哪种不容易发生生殖器异常出血
疱疹性咽峡炎与疱疹性口腔炎最主要的鉴别是
清代王清任治疗血瘀所致癫狂的方剂为()
税务机关有根据认为某企业有逃避缴纳增值税的行为,责令其在规定的纳税期前缴纳税款,该企业在限期内有明显的转移、隐匿其应纳税的商品、货物的行为,以下说法正确的是:()
否定之否定规律揭示了事物发展是()。
运动训练学理论的三个层次是()。
无产阶级的领导权是中国革命的中心问题,也是新民主主义革命理论的核心问题。要实现对同盟者的领导,必须具备的条件是
Accordingtothespeaker,whatshouldthelistenersdoassoonaspossible?
Whydoesthewomanwanttostayoutside?
最新回复
(
0
)