He tried to cope with the ever-increasing burden his work,but finally he_ and had to take a complete
题目
He tried to cope with the ever-increasing burden his work,but finally he_ and had to take a complete rest.
A.broke down B.broke in C.broke out D.broke up
选什么?
broke down 他坏了-
答案
A.broke down 身体跨掉,精神崩溃
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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