关于周期性麻痹，下列哪项不对
A．原因常不明B．无肌张力增高C．发作后可自行缓解D．发作时血钾高E．腱反射减弱
参考答案：D
The two categories of meaning of language proposed by Wilkins are "______" and "______".
成人牙齿过早松动脱落的主要原因是
A．肾阳虚衰
B．肾阴亏虚
C．肾气不固
D．肾精不足
E．肾不纳气
