To meet someone unexpectedly is to run __________ him
题目
To meet someone unexpectedly is to run __________ him
after
into
with
against 选哪个
答案
选into
run into 是“碰巧遇到”的意思,符合题意.
run after 追赶
run with与.一起跑步
run against 与.反方向跑
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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.
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