【初二】英语单选题:The electricity was cut,as the lights suddenly___.
题目
【初二】英语单选题:The electricity was cut,as the lights suddenly___.
【A.】went on
【B.】went over
【C.】went out
答案
C.go out 熄灭
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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.
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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