It should be done by the teacher! I don't quite understand the specific requirements of the new curriculum standard. Let me briefly talk about my opinion:

(1) This teacher's practice violates the principle of taking students as the main body, and his expected curriculum situation is disrupted and cannot be flexible. Moreover, it ignores universality and only teaches this one student.

(2) If I were a teacher, I would give the students a good compliment when they can give the correct answer quickly the second time, and then turn the topic to the whole class. "This classmate is very smart. He seems good at thinking. He has discovered this secret, but do other students also know this secret? " "Oh, most students don't know, is that good? This classmate, let's lead the students to explore the mystery! " Thus introducing new themes.