G．Another way to hide a message is to use symbols to stand for specific letters of the alphabet.
[语篇解读] 本文是一篇说明文，主要向读者介绍了几种类型的密码。
1．D 【解析】根据空格后的“Code breaking never lags(落后)far behind code making.”及关键词breaking可知，D项“只要有密码的存在，人们就会试图破解它们”承上启下，符合语境。故选D。
2．E 【解析】根据空格后的“the first letters of ‘My elephant eats too many eels’ spell out the hidden message ‘Meet me’”并结合选项可知，此处指可以利用每个单词的首字母来隐藏信息，E项是下文例子的概括，符合语境。故选E。
3．G 【解析】根据空格后的“You might represent each letter with a number，for example.”，并结合下文内容可知，也可以使用代号来代表字母表中特定的字母，G项可以引起下文，符合语境，故选G。
4．F 【解析】根据空格前的“you must have a code book”并结合空格后的“‘bridge’ might stand for ‘meet’…”可知，空格处指的是密码本的作用，因此F项“使用密码本，你可以记录那些代表其他单词的单词”能够衔接上下文，符合语境。故选F。
5．A 【解析】根据空格后的“However, it is also hard to keep a code book secret for long.”可知，空格后的内容表示转折，由此结合选项可知，A项“如果没有密码本，人们很难破解密码”能够与下文内容相衔接，且A项中的“It is very hard”与下句中的“it is also hard”相照应。故选A。 Ⅳ.短文改错
Many years ago，when I was a teenager，I had a chance attend the National Professional Dance Competition in Beijing.It is one of the nation's biggest art event.Before the competition was started，I practiced very hard to improve each step，gradually，one and one.I forgot that it was to be tired and just thought that I had to win.Every dancer had to choose the number.Because I was too concentrated on practicing for my performance，when the judges called her number，that I didn't hear it.Eventually I heard it.I cannot describe how exciting I was.Although this first competition was a long time ago，I still clear remember it. 【答案】
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