Keep your eyes _____ when you are doing eye exercises 为什么?
题目
Keep your eyes _____ when you are doing eye exercises 为什么?
答案
closed
表闭着 关闭状态时用 closed
开着的用open,不用 opened
He is sleeping with all the windows open and the door closed.
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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