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．a(chǎn)cknowledgeB．guaranteeC．identityD．clarify
B

試題分析：句意：三鹿奶粉事件是一個(gè)明確的跡象表明，食品安全是一個(gè)大問題；沒有人能保證所有食品都是安全的人，但可以肯定的是，情況已有所好轉(zhuǎn)。acknowledge 承認(rèn)；guarantee 保證；identity 身份、特性。clarify 澄清。根據(jù)句意最佳選B。
考點(diǎn): 考查動(dòng)詞在具體語境中的用法。
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