题目

Blogs are being used more and more by teachers. Many Internet services now offer free and easy ways to create personal Web pages. Through comments on blogs, or Web logs, teachers can share their classroom experiences. They can exchange ideas and discuss successes and failures. They can debate educational policies. Or they can just sympathize with each other. A teacher in the American state of North Carolina recently wrote on her blog: “Apparently the teachers at my school use too much paper. So my principal yelled at everyone at the last staff meeting for, like, ten minutes. Now, I’ve jus16．如图所示，直线AB，CD，EF相交于点O，且AB⊥CD于点O，∠BOE=70°，则∠FOD等于（　　）A．10°B．20°C．30°D．40°