There was a large building that was burnt ＿＿.
题目
There was a large building that was burnt ＿＿.
a.to the soil
b.to the ground
c.on earth
d.to the land
答案
选B
burn to the ground是固定短语!
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．
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