According to the latest reports on TV and in the newspaper food safety is becoming a ser

问题补充：

According to the latest reports on TV and in the newspaper, food safety is becoming a serious worldwide problem.

A. more and more

B. little by little

C. now and then

D. one by one

答案：

(答案→)A. more and more

B. little by little

C. now and then

D. one by one

解析： 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。