Random question answered Yes, by students, students use prior knowledge to answer questions such as How often ...? once/twice/three times/four hours...... a week/month.
Yes randomly asked students to answer the students' prior knowledge to answer the question How often ...? As once / twice / three times / four hours ...... a week / month.
Random ask students to answer Yes by students use prior knowledge to answer the question of the How often...? like once / twice / three times / four hours... To...? A week / month. .