【題目】Secret codes（密碼）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. 【1】Code breaking never lags（落后）far behind code making. The science of creating and reading coded messages is called cryptography.

There are three main types of cryptography. 【2】 For example, the first letters of “My elephant eats too many eels” spell out the hidden message “Meet me.”

【3】 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 “135520135.”

A code uses symbols to replace words, phrases, or sentences. To read the message of a real code, you must have a code book. 【4】 For example, “bridge” might stand for “meet” and “out” might stand for “me.” The message “Bridge out” would actually mean “Meet me.” 【5】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.

【答案】

【1】D

【2】E

【3】G

【4】F

【5】A

【解析】

試題分析：文章介紹了密碼的重要性、密碼的設(shè)置方式、密碼書的作用。

【1】D考查對(duì)上下文的理解和推理判斷能力。上句講人們使用密碼已經(jīng)幾千年了，下句講密碼破譯工作�？瞻滋幒兔艽a破譯有關(guān)，D項(xiàng)內(nèi)容符合語境，連接上下文。故選D.

【2】E考查對(duì)上下文的理解和推理判斷能力。后面的例子是來證明人們?cè)O(shè)置密碼時(shí)往往會(huì)利用一些單詞的第一個(gè)字母作為密碼，E項(xiàng)符合此內(nèi)容，故選E.

【3】G考查對(duì)上下文的理解和推理判斷能力。根據(jù)下文的解釋內(nèi)容可知介紹了密碼設(shè)置的又一種方法，G項(xiàng)符合此意，故選G.

【4】F考查對(duì)上下文的理解和推理判斷能力。根據(jù)下文的例子及上句中的a code book可以判斷該句是介紹密碼書的使用，F(xiàn)項(xiàng)符合此意，承上啟下。故選F.

【5】A考查對(duì)上下文的理解和推理判斷能力。上文介紹密碼書的重要作用，A項(xiàng)：沒有密碼書很難破譯，總結(jié)上文。故選A.

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