After the mine accident,the government sent a group of experts to _____.
题目
After the mine accident,the government sent a group of experts to _____.
A.look up
B.look into
C.look up
D.look after
(并说明原因)
答案
B.look into
表示深入调查的意思,这个最合适
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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