1.I had to buy ()these books because I did not know which one was the best.
题目
1.I had to buy ()these books because I did not know which one was the best.
A:all B:none C:both D:neither
2.()you ()out the problem,Sam?
Not yet,but I am going to
A:Did work B:Are working C:Have worked D:Will work
3.Have you ()been to Xia men?
NO,()
A:ever never B.never ever C:ever ever D:never never
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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