答案
　　36. natural
　　37. usage
　　38. exception
　　39. particular
　　40. reference
　　41. essays
　　42. colleagues
　　43. personal
　　44. What we may find interesting is that it usually takes more words to be polite
　　45. but to a stranger, I probably would say “would you mind closing the door?”
　　46. There are bound to be some words and phrases that belong in formal language and others that are informal.
　　原文
　　You probably have noticed that people express similar ideas in different ways depending on the situation they are in. This is very （36）natural. All languages have two general levels of （37） usage a formal level and an informal level. English is no （38） exception. The difference in these two levels is the situation in which you use a （39） particular level. Formal language is the kind of language you find in textbooks, （40） reference books and in business letters. You would also use formal English in compositions and （41） essays that you write in school. Informal language is used in conversation with （42） colleagues, family members and friends, and when we write （43） personal notes or letters to close friends. Formal language is different from informal language in several ways. First, formal language tends to be more polite. （44） What we may find interesting is that it usually takes more words to be polite. For example, I might say to a friend or a family member “Close the door, please”, （45） but to a stranger, I probably would say “Would you mind closing the door?” Another difference between formal and informal language is some of the vocabulary. （46） There are bound to be some words and phrases that belong in formal language and others that are informal. Let’s say that I really like soccer. If I am talking to my friend, I might say “I am just crazy about soccer”, but if I were talking to my boss, I would probably say “I really enjoy soccer”.

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