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学生说明
1. Tap 
2. Tap 
or
3. Sing the song!
4. Tap 
to OK your song.
5. Tap again to submit to the teacher.
教师备注（学生不可见）
For younger students, demonstrate the activity and then have them perform the activity. An extension to this lesson is to have the students mix up the parts to create a whole new version of Twinkle Twinkle Little Star.
