苯丙酮尿症的确诊主要依据是（）
A.智力低下
B.尿三氯化铁试验阳性
C.DNA分析
D.血中苯丙氨酸明显升高
E.尿和汗液有鼠尿味
参考答案：D
He devoted most of his time to his research, believing his hard work would___sooner or later.
A．put off
B．take off
C．come off
D．pay off
脊髓后索伤病的表现有（）
A.帕金森病
B.小脑共济失调
C.手足徐动及运动不能
D.齿轮样或铅管样肌张力增高
E.感觉性共济失调
