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The number of books in the bookshop ________ (be) about 10,000 and most of them are about science.
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After John had been in London for three years, he and his wife had a lot to tell ________.
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证明不管b取何值,方程y=x^3-3x+b=0在区间[-1,1]上至多有一个实根
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6元=________角 8角=________分 50分=________角 20角=________元
1年前