Experimentshaveprove的知识精选

Experimentshaveprovedthatchildrencan 
问题详情:Experimentshaveprovedthatchildrencan __41__(instruct)inswimmingataveryearlyage.AtaspecialswimmingpoolinLosAngeles,childrenbecomeexpertat __42__(hold)theirbreathunderwaterevenbeforetheycanwal...
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