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【简答题】
The sound of a crying baby is ___1__. This father has found a ___2__. But obviously he’d prefer to sleep in his own bed. It found that babies allowed to cry for short periods of time were no more ___3___ than babies whose parents ___4___ them.The authors of this new study don’t recommend letting babies ___5__ because it’s too ___6__ for parents.
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皮皮学刷刷变学霸
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