My job was to__each star and I also had many other duties.
题目
My job was to__each star and I also had many other duties.
A:beat B:teach C:introduce D:protect.解释词语意思
答案
C (A 打败,B教,C介绍,D保护.根据句意应该是介绍每棵星星）
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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