碱性最强的生物碱是（）
A.秋水仙碱
B.麻黄碱
C.番木鳖碱
D.新番木鳖碱
E.小檗碱
参考答案：E
解析：小檗碱为季铵碱，碱性最强。
He sat on his bed looking at his brother, _______ had his arms crossed and looked angry.
A．that
B．whom
C．who
D．which
脑疝形成的机理关键在于
A．颅内内容物体积增加B．颅内血容量增加C．颅内脑脊液量增加D．腰椎穿刺放出脑脊液E．颅腔内压力分布不均
