Question

【題目】第二節(jié)
根據(jù)短文內(nèi)容，從短文后的選項中選出能填入空白處的最佳選項，選項中有兩項為多余選項。
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. 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 根據(jù)后句內(nèi)容可以判斷此處提到了有密碼的設(shè)置就有破譯密碼的存在，D項可以承接上下文。
(2)E 根據(jù)后面舉的例子判斷該空應(yīng)該介紹藏起一個單詞前面的字母的密碼設(shè)置方法.
(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，判斷G選項符合語境，對應(yīng)詞represent和stand for。
(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。
(5)A 前后句都是介紹密碼書，后句講密碼書不會維持很久的時間，判斷A選項符合語境。