问题描述：
It's though second language.It's easy to learn,( )you don't hear it.
It's though second language.It's easy to learn,( )you don't hear it.it's sign language.(everybody)
说明理由
It's though second language.It's easy to learn,( )you don't hear it.it's sign language.(everybody)
说明理由
问题解答：
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