【題目】根據(jù)短文內(nèi)容，從短文后的選項(xiàng)中選出能填入空白處的最佳選項(xiàng)。選項(xiàng)中有兩項(xiàng)為多余選項(xiàng)。

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 “135 520 135.”

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：本文是一篇說明文，主要介紹了密碼的設(shè)置方法和破解的方法。

【1】D根據(jù)后句內(nèi)容可以判斷該空應(yīng)該和密碼的破譯有關(guān)，故判斷D項(xiàng)內(nèi)容符合語境邏輯，可以承接上下文。

【2】E后面舉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)字母來作為密碼，由此判斷E選項(xiàng)內(nèi)容符合語境邏輯。

【3】G根據(jù)后面的解釋內(nèi)容可以判斷這是介紹密碼設(shè)置的又一種方法，故判斷G選項(xiàng)符合語境。

【4】F根據(jù)后面的舉例以及前句中的 a code book可以判斷該句是介紹密碼書的使用，故判斷F選項(xiàng)可以起到承上啟下的作用。

【5】A根據(jù)空后內(nèi)容的轉(zhuǎn)折可知盡管利用密碼書可以破譯密碼，但是一本密碼書也不會(huì)使用很久的時(shí)間，故判斷A選項(xiàng)符合語境。

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