问题
单项选择题
以下化合物都被批准用于食物的防腐，除了（）之外。
A.二氧化硫
B.山梨酸
C.硝酸
D.苯甲酸
答案
参考答案：A
搜题请搜索小程序“爱下问搜题”
以下化合物都被批准用于食物的防腐，除了（）之外。
A.二氧化硫
B.山梨酸
C.硝酸
D.苯甲酸
参考答案：A
We think it’s probably a good idea for parents to allow teenagers ____in groups during the evenings. I know we get ____sometimes, but we learn a lot from each other. We also think that vacations should be ____.At present they’re too short. Longer vacations would give us time to do things like volunteering. ___summer I had an opportunity ___at the local hospital, but I couldn’t because I had to go back to school.
|