问题补充：
It is reported that 70% of people in China are about the food security situation after so many accidents.
A. curious
B. concerned
C. cautious
D. certain
答案：
A. curious
(答案→)B. concerned
C. cautious
D. certain
解析：词义辨析。Curious好奇地；concerned关心的；cautious谨慎地；certain肯定的。句意:据报道70%的中国人在多次事故后非常关注食品安全。选B。be concerned about关注。。。
