问题描述：
How many l______languages are there in the world?
1.How many l______languages are there in the world?
2.Let's stop m______nosic.The baby will fall asleep.
3.They collect waste paper for r____.
1.How many l______languages are there in the world?
2.Let's stop m______nosic.The baby will fall asleep.
3.They collect waste paper for r____.
问题解答：
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