—Chinese people are worried about the food they eat these days.
—Yes, the food safety is a serious in our country. We should try to solve it.
A. subject
B. program
C. problem
D. opinion
网友回答
A. subject
B. program
(答案→)C. problem
D. opinion
解析：subject科目；program程序，计划；problem问题，难题；opinion意见，主张。句意：这些天来中国人很担心他们吃的食物。——是的，食品安全在我国是个严重的问题。我们应该努力解决它。计划语境可知选C。