精华欲掩料应难，影自娟娟魄自寒。

一片砧敲千里白，半轮鸡唱五更残。

绿蓑江上秋闻笛，红袖楼头夜倚栏。

博得嫦娥应自问，何缘不梗永团圆？

注：诗的主旨是写离别之情。首联写月光及月的形态；颔联写月下之景；颈联写思念亲友之情，表达了作者的孤单感觉；尾联归结全诗主旨。

    It's a fine day. The Black（布莱克一家）are busy today. Tony and Gogo are going to the beach. Jenny is going to the park with her friends. Mrs. Black is going to the shopping mall. She is going to buy some milk and vegetables. Is Mr. Black going to the shopping mall, too? No, he isn't. He's going to stay at home. Look! He is reading the newspapers（报纸）.

如图，将一副直角三角板叠在一起，使直角顶点重合于点O，则∠AOB+∠DOC=____ 　度．