When it was 11o`clock at night,the lights ( )one after another.
题目
When it was 11o`clock at night,the lights ( )one after another.
A went up
B went down
C went out
D went back
答案
C
当到了晚上11点钟的时候,灯就会一个接着一个的熄灭
lights go out /lights out 灯熄灭的意思
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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