缩句。

①夜空星星眨眼对我说晚安。

②宽阔钱塘江笼罩着层薄薄雾。

将∠AOB绕点O顺时针旋转15°，得到∠COD，若∠COD=45°，则∠AOB的度数是（　　）

    I was only nine years old when I learnt how to use a computer．My mother is my first teacher．I know how to type，how to copy a file，and how to visit a website on the Internet．One day，mom was not at home．I turned on the computer and began to learn how to chat on net．The first one I met there was a boy called Tom．He greeted me politely．When he knew that I was only a 9-year-old girl and almost knew nothing about chatting on net，he started showing me how to use the chatting tools，how to download，and how to send e-mails．I learnt a lot from him．

阅读下面的元曲，然后回答问题。

清江引•秋居     吴西逸

白雁乱飞秋似雪，清露生凉夜。扫却石边云，醉踏松根月，星斗满天人睡也。