单选题 What does the author say is one disadvantage of online classes?

单选题 What problem may arise if classes go online?

单选题 What does the author suggest scientists do about public debate?

单选题 What does the author think open debate can do?

单选题 Why does the author say some experts’ anxiety seems misplaced?

单选题 What does the author think constitutes a key part of genuine education?

单选题 What does the author think of online course assignments?

单选题 Why did a recent debate published in The New York Times arouse concerns among experts?