Jack was out of money .He had a card on the board announcing that he had a radio set ( ).
题目
Jack was out of money .He had a card on the board announcing that he had a radio set ( ).
A.for sale B.on sale C.to sale D.in sale
翻译全句,选出正确answer并解释分析,
答案
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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