【正确答案】 B

【答案解析】[听力原文]1-10 Today I want to talk about levels of language usage. You probably have noticed that people express similar ideas in different ways, depending on the situation they are in. This is very natural. All languages have two general, broad categories, or levels of usage: a formal level and an informal level. English is no exception. I'm not talking about correct and incorrect English. What I'm talking about are two levels of correct English. The difference in these two levels is the situation in which you use a particular level. Formal language is the kind of language you find in textbooks, reference books such as encyclopedias, and in business letters. For example, a letter to a university would be in formal style. You would also use formal English in compositions and essays that you write in school. People usually use formal English when they give classroom lectures or speeches and at ceremonies such as graduations. We also tend to use formal language in conversations with persons we don't know well or with people we have a formal relationship with, such as professors, bosses, doctors, friends of our parents', strangers, etc. Informal language is used in conversations with colleagues, family and friends, and when we write personal notes or letters to close friends, as well as in diaries, etc. Formal language is different from informal language in several ways. However, today I'm going to talk only about a couple of ways. First of all, formal language tends to be more polite. Interestingly, it usually takes more words to be polite. For example, I might say to a friend or family member, "Close the door, please", but to a stranger or someone in authority I probably would say "Would you mind closing the door?" or "Excuse me, could you please close the door?" Using words like "could" and "would" makes my request sound more polite, but also more formal. Another difference between formal and informal language is some of the vocabulary. There are some words and phrases that belong in formal language and others that are informal. Let me give you a couple of examples of what I mean. Let's say "I'm just crazy about soccer!" But if I were talking to my supervisor or a friend of my parents', I would probably say "I really enjoy soccer" or "I like soccer very much". Let's say I'm telling someone some news I heard about the police arresting a criminal. To my friend I might say "The cops bagged the crook". To my parents' friend I might say "The police arrested the thief". Although the line between formal and informal language is not always clear and although people are probably less formal today than in the past, it is useful to be aware that these two levels, or categories, do exist. The best way for a non-native speaker of English to learn the difference is to observe the different ways English speakers speak or write in different situations. Television newscasters, your college professors in class, your doctors in their offices, ere, will usually speak rather formally. However, your classmates, teammates, family members, friends, etc. will generally speak in an informal fashion. The difference can be learned over time by observing and interacting with native speakers. 独自第一句话首先指出讲座的主题是语言的应用层面，然后在第四句话指出所有语言都有正式和非正式两个应用层面，并且紧跟着第六句又特别申明自己讲的不是语言的正确与否，因此题句是错误的。

【正确答案】 A

【答案解析】独白第十三句指出：We also tend to use formal language in conversations with persons... strangers, etc，即与不太熟悉的人或者与之有正式关系的人如教授、老板、医生、父母的朋友或者陌生人等交谈时我们常常用正式语言，题句中的第一次见面属于“陌生”的范畴，因此是正确的。

【正确答案】 B

【答案解析】独白第十四句指出：Informal language is used in conversations with colleagues...，即与同事交谈时多用非正式语言，题句意思正好与此相反，因此是不对的。

【正确答案】 B

【答案解析】独白第一段中指出正式语言出现在教科书、参考书、商务信函等中，并举例说写给大学的信函、在英语作文等中要用正式语言；而该段最后一句则说在写个人便条、给密友写信或者写日记时则多用非正式语言。由此可知题句中的all kinds of writings太过绝对，是不正确的。本题和上面几题都可根据常识直接判定正误。

【正确答案】 A

【答案解析】题句信息对应于独白第二段第一句：Formal language is different from informal language in several ways，题句中只是把several换成了many，是正确的。注意下一句中的a couple of指的是“两个”。

【正确答案】 A

【答案解析】独白第二段第四句明确指出：it usually takes more words to be polite(通常要用更多的词来表达礼貌)，题句只是与此表达不同。

【正确答案】 B

【答案解析】由独白第一段的说明可知医患之间属于正式用语的范畴，而由独白第三段所举的例子可以看出 be crazy about是个非正式短语，无疑不能用在正式关系和场合下，因此题句是不正确的。

【正确答案】 A

【答案解析】本题由常识即可推知正确。独白第三段最后两句明确说明了用cop和police的不同场合。

【正确答案】 A

【答案解析】题句信息对应于独白最后一段第一句中的people are probably less formal today than in the past，即如今的人们比过去要随意一些，反过来就是说过去的人们比现在的人们正式一些，与题句意思相同。

【正确答案】 A

【答案解析】独白最后一段第二句指出了解正式与非正式用语区别的最佳办法是观察英国人在不同场合下说话或者写作的不同方式，而在独白最后一句又指出可以通过观察、与本国人交流来了解这种差异，综合这两处就是题句的意思，因此题句正确。