题目内容
1.Secret codes (密码) keep messages private.Bank,companies,and government agencies use secret code in doing business,especially when information is sent by computer.People have used secret codes for thousands of years.(36)DCode breaking never lags(落后) behind code making.The science of decoding and reading coded messages is called cryptography.
There are three main types of cryptography.(37)EFor example,the first letters are"My elephant eats too many eels"spell out the hidden message"Meet me."
(38)GYou 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"1 3 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.(39)FFor example,"bridge"might stand for"meet"and"out"might stand for"me".The message"bridge out"would actually mean"Meet me".(40)AHowever,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.
F.Then you need to pick a name for your club.
G.Use a bright thick pen to make a special design.
分析 本文是一篇说明文,密码使信息变得私密,公司和政府机构使用密码运行,尤其是当信息通过计算机发送.本文以此展开,主要介绍了密码的设置方法和破解的方法.
解答 36.D.考查文章内容理解以及上下文联系.根据后句内容Code breaking never lags(落后) behind code making.可以判断,该空应该和密码的破译有关,故判断D项内容符合语境逻辑,可以承接上下文.
37.E.考查文章内容理解以及上下文联系.后面举的例子For example,the first letters are"My elephant eats too many eels"spell out the hidden message"Meet me."是来真名人们设置密码时往往会利用一些单词的第一个字母来作为密码,由此判断E选项内容符合语境逻辑.
38.G.考查文章内容理解以及上下文联系.根据后面的解释内容You might represent each letter with a number,for example,let's number the letters of the alphabet,in order,from 1 to 26.可以判断,这是介绍密码设置的又一种方法,故判断G选项符合语境.
39.F.考查文章内容理解以及上下文联系.根据后面的举例以及前句中的 a code book可以判断,该句是介绍密码书的使用,故判断F选项可以起到承上启下的作用.
40.A.考查文章内容理解以及上下文联系.根据空后内容的转折However,it is also hard to keep a code book secret for long.So codes must be changed frequently.可知尽管利用密码书可以破译密码,但是一本密码书也不会使用很久的时间,故判断A选项符合语境.
点评 本文是一篇选句填空阅读,题目主要考查文章内容理解以及上下文联系.做题时学生应仔细阅读原文,把握文章主要内容,联系文章上下文内容并结合所给选项含义,从中选出正确答案,一定要做到有理有据,切忌胡乱猜测.
![](http://thumb2018.1010pic.com/images/loading.gif)
A. | ambiguous | B. | explicit | C. | figurative | D. | clumsy |
A. | consisted of | B. | having been consisted of | ||
C. | to consist of | D. | consisting of |