David Evans:“Quizzes are part of the lecture to keep students engaged and keep them thinking,for students to be able to check that they understood what we covered.Those are not graded and students can try those as often as they wish.They can repeatedly watch the videos and take the quizzes whenever they want.”

　　Students receive homework.They join online groups to exchange questions and answers about the course.The teachers hold office hours to answer questions that the students have voted to send them.They also present their own questions and observations to the students in order to help them make a deeper impression of the course.

　　The students take a final examination to show where they rate in the class.Everyone who finishes the course receives a grade and proof of completion.Top students get letters documenting their work.

　　Mr.Thrun started Udacity,which supports free MOOCs.Udacity hopes to make a profit in the future by connecting possible employers with interested students.On his Stanford homepage he says he wants to “democratize” education.Education,he says,should be free,accessible for all,anywhere and anytime.

　　1.What can we know about MOOCs from the passage?

　　A.Not all of them are free.

　　B.They are bad dreams for teachers.

　　C.They are popular among high school students.

　　D.All of them are about computer science and technology.

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