She was so________that she wouldn't give in until she received a full apology.[ ]

A．simple  

B．lucky

C．stubborn  

D．proper

苯巴比妥或司可巴比妥中“中性或碱性物质”检查应采用

A．比色法
B．旋光度测定法
C．折光率测定法
D．提取重量法
E．熔点测定法