—HaveyouheardthatBreadTalkusedoverdue(过期)powdertomakebr...

问题详情：

—Have you heard that Bread Talk used overdue (过期) powder to make bread?

—Yes. The food safety is a serious       . 

A. problem              B. question                  C. course             D. opinion

【回答】

A   

知识点：名词

题型：选择题