谁知道英语了 AT的用法
题目
谁知道英语了 AT的用法
答案
prep.
1.在...地点 They were already waiting at the gate when I got there.当我到达那里时,他们已等候在门口了.
2.在...时刻 Jane will meet her boy friend at Christmas.简将在圣诞节和她男友见面.
3.向,朝,对着 Don't shout at me.别对我叫喊.
4.在...方面 He is an expert at troubleshooting.他是位排解争端的能手.
5.因为,由于 I woke at the sound of the bell.随着铃响,我醒了.
6.从事于,忙于 He is working hard at this thesis.他正在努力地撰写论文.
7.以(某种价格、速度等) They sold the cloth at a dollar a yard.他们以每码一元的价格出售这种布.
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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