英语翻译
题目
英语翻译
请告诉我你多久收到一次你父母的来信.
你能猜出他会给我们讲多少笑话吗?
答案
Can you explain (that) why you didn't hand in your homework on time?Please tell me (that) how often you hear from your parents.Can you guess (that) how many jokes he can tell to us?
举一反三
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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