下列哪种药物在某院是限制使用抗菌药物？（）
A.注射用氨曲南
B.注射用拉氧头孢钠
C.注射用头孢西丁
D.注射用头孢唑啉
参考答案：C
选择正确的单词完成句子。
1. I am __________ (in, at) the park.
2. __________ (Where, What) are you from?
3. I __________ (eat, see) with my eyes.
4. I am eight __________ (year, years) old.
5. I have __________ (one, two) nose.
6. We are __________ (student, students).
7. I __________ (smell, hear) with my nose.
两个分数相除，商一定比被除数大．______．
