紫雪丹长于
A．化痰开窍，消肿止痛B．清热解毒豁痰C．芳香开窍，化浊D．熄风止痉E．芳香开窍，温中
参考答案：D
_____ he is ill, _____ he goes to school. [ ]
A. Although, but
B. /, /
C. Although, /
D. But, although
下列哪一种措施不能增加浓度梯度（）
A.不断搅拌
B.更换新鲜溶剂
C.将浸出液强制循环
D.动态提取
E.高压提取
