turn
题目
turn
答案
turn up:vt.朝上翻(出现,来到,卷起,找到,被找到,出现,发生)例句与用法:He turned up his coat collar against the chill wind.他竖起大衣领抵御寒风.I can't hear the radio very well; could you turn it up a bit?...
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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