一道SAT改错题
题目
一道SAT改错题
Representatives of 2 independent groups (have been asked) to rewiew resent studies comparing the (monthly) costs of using cell phones with (conventional phones).(no error)
conventional phones应该改成the monthly costs of using conventional phones 还是using conventional phones?
答案
the monthly costs of using conventional phones
因为是价格的对比 前后要一致
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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