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. acknowledge
B. guarantee
C. identity
D. clarify
网友回答
A. acknowledge
(答案→)B. guarantee
C. identity
D. clarify
解析：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。