The Sanlu Milk Powder event is a clear indication that food safety is a big problem; nobody can ___ all foods are secure to us, but we are sure that the situation is turning for the better．A.acknowledgeB.guaranteeC.identityD.clarify
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B解析试题分析：句意：三鹿奶粉事件是一个明确的迹象表明，食品安全是一个大问题；没有人能保证所有食品都是安全的人，但可以肯定的是，情况已有所好转。acknowledge 承认；guarantee 保证；identity 身份、特性。clarify 澄清。根据句意最佳选B。考点: 考查动词在具体语境中的用法。