parents are warned that( )to lead,a heavy soft metal,can damage the brains of young children.
问题描述：
parents are warned that( )to lead,a heavy soft metal,can damage the brains of young children.
.A.existence B.exposure C.relation D.evolution.括号里应该填什么?
答
B
暴露在……之下,不采取防护措施.可以翻译一下这个句子吗?家长被告诫：如果暴露在铅（一种重金属）之下，会损伤小孩们的大脑。