Yes, 英语自然拼读法第1级 is completely free and it doesn't have any in-app purchases or subscriptions.
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英语自然拼读法第1级 is free.
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Chart
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Category
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Rank
|
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Top Paid
|
|
23
|
Top Paid
|
|
28
|
Top Paid
|
|
57
|
Top Paid
|
|
60
|
Top Paid
|
|
71
|