Asking other students instead makes the whole class accountable for answering every question. Calling on a student. Selecting a student to respond before posing a question means the other students never formulate an answer. Asking the question first makes all students more likely to pay attention and think of a response. Repeating students' answers.
Teachers typically repeat students' answers.
However, when they do not, students pay greater attention to and show increased respect for their classmates' responses.