食品中可能存在的有害因素按来源有()。
A、食品污染物
B、食品中天然存在的有害物质
C、食品添加剂
D、食品加工、保藏过程中产生的有害物质
参考答案:A, B, C, D
根据句义和所给首字母提示完成句中所缺的单词。
1. What is your e-mail a_________? It is LINTAO@126.COM.
2. My mother and father are my p__________.
3. I like s_________ very much .It is interesting.
4. __________ When is your birthday?
__________My birthday is F_________ tenth
5. He usually gets up at a__________ 8:00 in the morning.
认知心理学将理解问题看做是在头脑中形成问题空间的过程。( )