Collecting stamps as a hobby became increasingly popular during the past
题目
Collecting stamps as a hobby became increasingly popular during the past
fifty years.
A.错误
B.正确
答案
B,during the past few years 为完成时的标志,所以用 has become
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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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