需求收入弹性的符号（）-湖北继续教育网网校

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[单选题]需求收入弹性的符号（）

A为正

B为负

C为0

D难以判别

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1. 4.A great difference between American social customs and those of other countries is the way in which names are used. Americans have little concern for "rank", especially socially. Most Americans do not want to be treated in any especially respectful way because of their age or social rank; it makes them feel uncomfortable. Many Americans even find the terms "Mr.", "Mrs" or "Miss" too formal. People of all ages may prefer to be called by their first names. "Don't call me Mrs Smith. Just call me Sally." Using only first names usually indicates friendliness and acceptance. However, if you do not feel comfortable using only first names, it is quite acceptable to be more formal. Just smile and say that after a while you will use first names but you are accustomed to being more when you first meet someone. Very often, introductions are made using both first and last names: " Mary Smith, this is John Jones." In this situation you are free to decide whether to call the lady "Mary" or "Miss Smith". Sometimes both of you will begin a conversation using last names, and after a while one or both of you may begin using first names instead. You have a choice: if you don't want to use first names so quickly, no one will think it impolite if you continue according to you own custom.(10分)4.1 In the first paragraph the author tells us that____(2分)A. Americans do not talk about rank, especially sociallyB. Americans feel uncomfortable when talking about rankC. Americans take interests in social customsD. Americans don't care much about social rank
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