Use in Duolingo Learn Chinese situation

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This study as for me very important. So please submit all questions answer.
1.
Your gender:*
2.
Which country are you from?  (2到10字)
3.
How long have you learned Chinese?* 【最少选择1项】
4.
What is your way of learning Chinese* 【最少选择1项】
5.
Why do you use mobile apps to learn Chinese? (5到50字)
6.
In which way does a mobile app for learning Chinese help you the most?* 【最少选择1项】
7.
What ways you think a mobile app is not good for learning Chinese? (最少5字)
8.
How long have you been using Duolingo to learn Chinese?* 【最少选择1项】
9.
What is your Chinese level in Duolingo?* 【最少选择1项】
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