所有的食品都应提供充分的产品信息以使食物链的下一个经营者能安全、正确地对食品进行处理、展示、贮存和制作。
参考答案：对
句型转换。
1. Linda carries some new books to school library. (改为一般疑问句)
_____ Linda _____ any new books to school library?
2. He will return the bike in ten minutes. (对画线部分提问)
_____ _____ will he return the bike?
3. "Does your sister clean her room every day?" Mom asked me. (改写句子，句意不变)
Mom asked me _____ _____ sister _____ her room every day.
4. Tom played volleyball after he helped his mom with chores. (改写句子，句意不变)
Tom _____ _____ volleyball _____ he helped his mom with chores.
单钥密码体制的算法有（）
A.DES
B.IDEA
C.RC-5
D.AES
E.RSA
