our teacher asked us to write a __articleA.two-thousand-word B.two-thousand-wordC.two-thousands-word
题目
our teacher asked us to write a __articleA.two-thousand-word B.two-thousand-wordC.two-thousands-words D.two-thousand-words答案选C 但我记得有一道题的答案选three-year-old boy 为什么本题的thousand要加S呢 请给出详细解答 谢谢 什么样的词放在中间需加S?
答案
答案可能错了 选two-thousand-word
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已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
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