治疗肺胃出血，宜首选（）
A．白及
B．大蓟
C．槐花
D．地榆
E．白及根
参考答案：B
All the universities have duty to _______ their students ____of the quick development of the scientific world.
A．make; known
B．have; understood
C．keep; informed
D．find; included
有关被动扩散的特征不正确的是
A．不消耗能量B．具有饱和现象C．由高浓度向低浓度转运D．不需要载体进行转运E．转运速度与膜两侧的浓度成正比
