如图，矩形ABCD沿AE折叠，使D点落在BC边上的F点处，如果∠BAF＝60°，则∠AEF＝____．

下列句中划线的成语使用不恰当的一项是（       ）

___________ birthday.（）

Hello, I’m Linda. I have four friends. They are Ann, Lisa, Tom and Peter. Ann lives near school. She comes to school on foot. There is an underground station near Lisa’s home. She comes to school by underground. Tom lives far from school. He comes to school by bus. Peter likes riding. He comes to school by bike.

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已知$\left|\overrightarrow{OA}\right|=1,\left|\overrightarrow{OB}\right|=\sqrt{3},\angle AOB=\frac{5\pi }{6}$点C在∠AOB外且$\overrightarrow{OB}·\overrightarrow{OC}=0$,设实数m,n满足$\overrightarrow{OC}=m\overrightarrow{OA}+n\overrightarrow{OB}$则$\frac{m}{n}$等于（　　）