题目内容

According to the latest reports on TV and in the newspaper, food safety is becoming a ____________ serious worldwide problem.
A．more and moreB．little by littleC．now and thenD．one by one
A
四个选项分别表示越来越、渐渐地、不时地和一个接一个的，根据题意选项A为最佳答案，食品问题变得越来越严重。
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