胸4～5节段感觉（）。
A.颈部
B. * * 部
C.脐部
D.胸骨剑突
E.腹股沟部
参考答案：B
黄体酮
A．四氮唑比色法B．铁-酚试剂比色法C．异烟肼比色法D．气相色谱法E．碘量法下列药物可采用的含量测定方法为
-What about you, Ben?
-__________ too hard for me to understand the native speakers. They speak too quickly.[ ]
A. This is
B. That's
C. It's
D. Its
