放射免疫分析的特点为（）
A.核素标记抗体
B.核素标记抗原
C.反应速度较慢
D.反应速度较快
E.标记物限量
参考答案：B, C, E
Have you seen Tom recently? I wonder ____ with his studies.
A．how is he getting along
B．that he gets along well
C．how he is getting along well
D．if he is getting along well
板蓝根善治（）
A.乳痈
B.肠痈
C.肺痈
D.咽喉肿痛
E.疔毒
