问题
选择题
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
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。