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第1题

No country in the world has more daily newspapers than the U.S.A. There are almost 2,000 of them, as compared with 180 i
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第2题

Upon reaching an appropriate age (usually between 18 and 21 years), children are encouraged, but not forced, to “leave t
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第3题

Learning the language of a country isn.t enough. If you know the manners of your foreign friends, you will probably be s
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第4题

已知数列{an}的通项公式为an=3n+2n+(2n-1),求其前n项和
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