除哪项外均为不寐的病因：
A．情志所伤
B．饮食不节
C．外邪侵袭
D．素体虚弱
E．心虚胆怯
参考答案：C
---- How long ____ at this job?
---- Since 1990.
A．were you employed
B．have you been employed
C．had you been employed
D．will you be employed
八仙糕2功效与作用
