如图，点O，A，B在同一直线上，OC平分∠AOD，OE平分∠FOB，∠COF=∠DOE=90°，求∠AOD．

在0， $\frac{22}{7}$ ，π﹣1，0.121121112…（每两个2之间依次多一个1），0.6 $\dot{5}$ 这5个数中，无理数有____个．

根据短文内容的理解，选择正确答案。    The earliest newspapers started in ancient Rome. They were handwritten news sheets. The first printed newspapers appeared in China during the Tang dynasty, which were printed from carved wooden blocks. Modern papers first appeared in Venice, Italy in the middle of the 14th century. The newspapers of today, with advertising and a mixture of political, economic, and social news and comments, were started in Britain in the mid-18th century.
    The main function of newspapers is to report news. Many newspapers also provide special information to readers, such as weather reports and television timetables. They also provide comments on politics, economics, arts and culture. Almost all newspapers depend on advertising to make money.
    Nearly six out of ten adults in the United States and Canada read a newspaper every day. Seven out of ten read a paper each weekend. Readers search newspapers for detailed background information and analysis. This is what television and radio news reports seldom offer. Newspapers tell readers what happened, and they also help readers understand what caused an event and how it will affect the world around them.
    The workers at large newspaper companies work under a lot of pressure to bring news to readers as soon as possible. Reporters, photographers, artists, and editors collect articles in just a few hours. Page designers select articles, photos, advertisements, and eye-catching headlines to make the pages, and then rush their work to the printer. Printing workers may work overnight around printing presses to churn out more than 60,000 copies per hour.

三张扑克牌的牌面如图所示，这三张扑克牌除牌面不同外，其它均相同．将这三张扑克牌背面朝上洗匀，从中随机抽出一张，记下数字后放回；重新洗匀后从中再随机抽出一张，记下数字．请用画树状图（或列表）的方法，求抽出的两张扑克牌上的数字之和是9的概率．

春秋战国时期是我国传统农业经济形式和发展的关键时期，下列有关该时期经济发展特点的叙述正确的有                                       （   ）
①铁犁牛耕的耕作方式开始形成          ②传统小农经济形成并开始成长　
③耕作细作技术进入全面成熟期          ④官府垄断商业的局面已被打破