按微生物控制分类，实验动物分为（）
A.一类
B.二类
C.三类
D.四类
E.五类
参考答案：E
When Akiyama Toyohiro, Japan's first astronaut, completed his stint in space, he came back down to earth with more than one worry.
A．spell
B．sling
C．sting
D．stink
钱乙遣方用药的特点是什么？
