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No matter how the math works out, you persistently view restaurants with voluntary tipping systems as being a better value, which makes it extremely difficult for restaurants and bars to do away with the tipping system.
出自-2016年12月阅读原文
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It can be acquired through persistent practice.
出自-2016年12月阅读原文
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Almost every child, on the first day he sets foot in a school building, is smarter, more curious, less afraid of what he doesn't know, better at finding and figuring things out, more confident, resourceful (机敏的), persistent and independent than he will ever be again in his schooling – or, unless he is very unusual and very lucky, for the rest of his life.
出自-2010年6月听力原文
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A few months ago, I was down with a terrible cold which ended in a persistent bad cough.
2018年12月四级真题（第三套）阅读 Section A
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Just lengthening that second stage of full-time work may secure the financial assets needed for a 100-year life, but such persistent work will inevitably exhaust precious intangible assets such as productive skills, vitality, happiness, and friendship.
2019年6月四级真题（第一套）阅读 Section B
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These likely persistent forces, like the growth of shale ( ' , 页岩) oil, point to a low for long scenario.
出自-2017年6月阅读原文
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Yet the persistent question of Why do I need that? – or, perhaps more tellingly, Why do you need to know that? – dogs the steps of many new ventures.
出自-2016年12月阅读原文
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She achieved her fame through persistent advocacy of fake science.
出自-2014年6月阅读原文
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Care for older people faced persistent criticism as these trends became apparent.
2018年12月六级真题（第二套）听力 Section C
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I had to be really persistent and it was very hard work.
2019年12月六级真题（第一套）听力 Section A
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The persistent haze over many of our cities is a reminder of the polluted air that we breathe, over 80% of the world's urban population is breathing air that fails to meet World Health Organisation guidelines.
2019年12月六级真题（第二套）阅读 Section A
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These likely persistent forces, like the growth of shale oil, point to a "low for long" scenario.
2017年6月六级真题（第一套）阅读 Section B