Question

【题目】第二节
根据短文内容，从短文后的选项中选出能填入空白处的最佳选项，选项中有两项为多余选项。
Secret codes (密码)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. 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. For example, the first letters of “My elephant eats too many eels” Spell out the hidden message “Meet me.”
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 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. For example “bridge“ might stand for “meet” and “out” might stand for “me.” The message “bridge out” would actually mean “Meet me.” 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.

Answer 1

【答案】D；E；G；F；A
【解析】(1)D 根据后句内容可以判断此处提到了有密码的设置就有破译密码的存在，D项可以承接上下文。
(2)E 根据后面举的例子判断该空应该介绍藏起一个单词前面的字母的密码设置方法.
(3)G 根据后面的解释内容可以判断这是介绍密码设置的又一种方法，判断G选项符合语境，对应词represent和stand for。
(4)F 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。
(5)A 前后句都是介绍密码书，后句讲密码书不会维持很久的时间，判断A选项符合语境。