理想的清除试验是（）
A.葡萄糖清除试验
B.Na+清除试验
C.BUN清除试验
D.内生肌酐清除试验
E.菊粉清除试验
参考答案：E
三省六部制由来已久，其最终定型是在( )。
A．北周
B．唐朝
C．隋朝
D．北魏
第二节 开放作文（15分）
请根据下面提示，写一篇短文。词数不少于50。
In your English class, your teacher shows you he following picture. You are asked to describe the picture and explain how you understand it.
______________________________________________________________________________________________________________________________________________________________
