Five months ago. I ____(happen) to be upstairs at dusk when the window was open. I didn't go downstairs until the window had to ____(shut). The dark, rainy evening, the wind and the thundering clouds held me ____(entire) in their power.

    It was the first time in one and a half ____(year) since we found shelter here that I'd seen the night face to face. Sadly I am only able to look at nature through dirty curtains ____(hang) before very dusty windows.____is no pleasure looking through them because nature is one thing____really must be experienced. One evening when it was so warm. I stayed ____(wake) on purpose until half past eleven in order to have ____good look at the moon by myself. But as the moon gave far too much light, I ____(not dare) to open the window.

在我国经济生活中，有一种“龟兔双赢理论”。龟兔赛了多次，互有输赢，后来龟兔合作，兔子把乌龟驮在背上在河边跑，然后乌龟又把兔子驮在背上游过河，这就是“双赢”。“龟兔双赢理论”给我们的启示是（      ）

材料一：下图使华北地区地形图和京津冀地区一体规划图

材料二：2015年2月26日，是京津冀协同发展战略1周年。京津冀地区区域城际交通一体化；2014年京津冀区域PM2.5年均浓度同比下降12%；在产业上北京以外迁为标志，于河北、天津签署了科技、市场等多项区域的合作协议。

材料三：黄河三角洲湿地，有草甸、芦苇等众多的动植物分布。河流纵横交错，是“中国最每的六大湿地”之一。

计算：（﹣ ）⁰=（　　）.