深圳证券交易所限制上市开放式基金交易价格涨跌幅比例为10%，自上市首日起执行。( )
参考答案：对
----Another cup of tea? That’s your third since lunch.
----Yeah, well, I ____ all night preparing for my history exam. I can hardly keep my eyes open.
A．have stayed up
B．stayed up
C．have been staying up
D．will stay up
哥哥与弟弟今年的年龄比是5：3，哥哥今年15岁，弟弟今年______岁．
