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。