The teacher suggested that we learn from the past ,____ the present and hope for the future.
题目
The teacher suggested that we learn from the past ,____ the present and hope for the future.
A:experience B:experiment C:adventure D:dream
答案
A
老师建议我们从过去中学习经验,作好当前每一件事情,并且对未来充满希望
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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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