看图,根据上下文情景完成对话.yangling:hi,helen.how are you?helen:fine,thank you,and you?
题目
看图,根据上下文情景完成对话.yangling:hi,helen.how are you?helen:fine,thank you,and you?
yangling:i am going to buy some postcards.where can i buy them?helen:go to the big____ _____on river road.you will find a lot of postcards here.helen:where should i ____ ____?
答案
post office
find it
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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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