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墙面装装饰清单项目主要有哪些？
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Complete the following passage with words chosen from this unit. The initial letter of each is given.Many of us these days are learning a foreign language. We are interested in learning another language because we know that knowledge of another language and culture will increase our career opportunities, broaden our horizons and enrich our life. Since learning a foreign language is of such importance, no d______(1) people are constantly looking for more e______(2) ways of language learning. Most people say the best way to learn a language is to stay in the country w______(3) it is spoken. It is true those who go to a native country have an a______(4) over those who don't . But living abroad needs money, and not everyone can a______(5) to do so. Those who don't go abroad may turn to language schools for help. Language schools usually c______(6) that they can teach students to speak the language they want to learn f______(7) within 3 to 6 months because they have more q______(8) teachers and better facilities. To a certain e______(9), a good teacher is indeed important in language learning, but it would be r______(10) to claim that any teacher has discovered a p______(11) way of teaching English in every possible situation. In fact, there are a______(12) many good methods of teaching a language as there are good teachers, b______(13) every teacher is an i______(14) with his/her own personality. What a student needs to remember then is to find out a method that best suits himself/herself.
5．在长期中，下列成本中哪一项是不存在的（）
4．不随着产量变动而变动的成本称为（）
6．随着产量的增加，平均固定成本（）
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