【正确答案】 C

【答案解析】[听力原文] Many people enjoy secret codes. The harder the code, the more some people will try to figure it out. In war time, codes are especially important. They help army send news about battles and signs of enemy forces. Neither side wants its code broken by the other. One very important code was never broken. It was used during World War Two by the Americans. It was a spoken code, never written down and it was developed and used by Navajo Indians. They were called the Navajo code talkers. The Navajos created the code in their own language. Navajo is hard to learn and only a few people know it. So it was pretty certain that the enemy would not be able to understand the code talkers. In addition, the talkers used code words. They called a submarine an iron fish and a small bomb thrown by hand a potato. If they wanted to spell something, they used code words for letters of the Alphabet. For instance, the letter A was ant or apple or ax. The code talkers worked mostly in the islands in the Pacific. One or two would be assigned to a group of soldiers. They would send messages by field telephone to the code talker in the next group. And he would relay the information to his commander. The code talkers played an important part in several battles. They helped troops coordinate their movements and attacks. After the war, the U.S. government honored them for what they had accomplished. Theirs was the most successful wartime code ever used. Q: What does the speaker say many people enjoy doing? 1.四项都是名词性短语。 2.四项中心词分别是secrets，information，messages，news，是同义词。 本题很可能以what提问，可能与秘密、消息、新闻等有关。听音时应注意将重点放在与四个选项相关的关键信息上。 题目问的是讲话者说很多人喜欢做什么。文章开头部分提到：很多人喜欢秘密代码。代码越难，有些人越会试图把它弄明白。选项C“破解秘密消息”正是对这两句话的总结概括，因此为正确答案。其他三个选项原文均未提及，均排除。

【正确答案】 A

【答案解析】[听力原文] Q: What do we learn about the Navajo code talkers? 1.四项都以they开头，都陈述了they的所作所为或专长。 2.两项包含enemy。 本题考查的内容与they有关，可能涉及they的所作所为或专长，可能是文章的某个细节，也可能是文章的主旨。听音时应注意判断they的指代对象，并将重点放在四个选项的关键信息上(helped the U.S. army，write down spoken codes，assigned to decode enemy messages，good at breaking enemy secret codes)。 题目问的是我们了解到纳瓦霍密语者的什么信息。文章结尾部分提到：密语者在数场战役中发挥了重要作用。他们帮助部队协调行动和进攻。战后，美国政府表彰了他们取得的成就。选项A正是对这部分内容的总结概括，因此为正确答案。文中说它是口述的代码，从来没有被写下来过，因此选项B不对；选项C和D原文均未提及，故均排除。

【正确答案】 C

【答案解析】[听力原文] Q: What is the speaker mainly talking about? 1.四项都是名词性短语。 2.两项含有war，一项含有military。 本题很可能以what提问，可能询问与战争或军事相关的内容。听音时应注意将重点放在与四个选项相关的关键信息上。 题目问的是讲话者主要谈论了什么内容。文章开头部分提到：有一个非常重要的代码从未被破解出来，二战期间它被美国人使用。接下来的内容都是围绕这句话展开的。由此可知选项C正确。选项A原文未提及，选项B和D中的“破解”不是讲话者讲述的主要内容，故均排除。