下列不属于食品卫生检验采样原则的是（）
A.代表性
B.典型性
C.适时性
D.常规性
E.按程序操作
参考答案：D
用括号内所给单词的正确形式填空。
1. The famous_________(predict) will come true next year.
2. We will have_________ (little) pollution than before.
3. They want to know if he_________(arrive) in Yantai in 2 days.
4. There are many people ___________(have) a rest.
5. He_________(be) 17 years old next year.
一朵花的主要结构是（ ）
A．子房
B．子房和花药
C．雌蕊和雄蕊
D．花瓣
