关于恐龙的英语作文(60字)
题目
关于恐龙的英语作文(60字)
答案
Dinosaurs are very large creatures which appeared on the earth millions of years ago.They became extinct many years later because of a change in climate and they could no longer find any food to eat.Today,people know that dinosaurs had once existed because scientists discovered the remains of their bones when they dug underneath the ground.We can see the skeletons of these dinosaurs now in the museums.
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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