【步步高】（全国通用）2017版高考英语二轮复习 考前三个月 专题二 七选五 精研高考真题，寻找解题规律 真题演练（一）.doc

精研真题　模拟演练 A (2016·全国Ⅰ) 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. 36 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. 37 For example，the first letters of “My elephant eats too many eels” spell out the hidden message “Meet me.” 38 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 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 For example，“bridge” might stand for “meet” and “out” might stand for “me.” The message “Bridge out” would actually mean “Meet me.” 40 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. 36．答案　D 解析　考查综合分析能力。联系下一句“创设密码和破译密码总是相伴而生的”，可以推断此处意思是“只要有密码存在，人们总是千方百计地进行破译”。故选D项。 37．答案　E 解析　考查联系上下文的能力。依据接下来的举例可知，这里讲的是选取每个单词的首字母这一方法来隐藏信息。因此答案为E。 38．答案　G 解析　考查运用语境进行推断的能力。前文已经介绍了一种设置密码的方式，这里又介绍了另一种。故选G。G项中的another也是解题的关键标志词。 39．答案　F 解析　考查联系上下文的能力。空格前的a code book暗示答案可能为F项，通过验证，两句意思通顺自然，衔接紧密。故答案为F。 40．答案　A 解析　考查综合分析能力。分析语境可知，该处仍在谈论密码本，由此可锁定A项，该句与空后一句衔接紧密，可确定为答案。 B (2016·全国Ⅱ) A Garden That’s Ju