MRI表现见双侧豆状核区T1低信号，T2高信号，考虑为何种疾病() ["A．特发性震颤","B．肝豆状核变性","C．帕金森病","D．进行性核上性麻痹","E．多系统萎缩"] 帕金森病主要生化病理是在黑质.纹状体中() ["A．多巴胺增多，乙酰胆碱能功能减退","B．多巴胺减少，乙酰胆碱能功能减退","C．多巴胺增多，乙酰胆碱能功能减退","D．多巴胺减少，乙酰胆碱能功能亢进","E．多巴胺减少，GABA神经递质增多"] 震颤为帕金森病最早的症状，其发生率为() ["A．约20%","B．约40%","C．约50%","D．约70%","E．约90%"] 抽动秽语综合征的可能发病机制是纹状体中存在() ["A．多巴胺含量增多，多巴胺受体功能减退","B．多巴胺含量增多，多巴胺受体超敏","C．多巴胺含量减少，多巴胺受体超敏","D．多巴胺含量减少，多巴胺受体功能减退","E．多巴胺含量正常，乙酰胆碱含量减少"] 帕金森病为何种步态异常() ["A．醉酒步态","B．共济失调步态","C．剪刀步态","D．慌张步态","E．鸭步态"] MRI表现为尾状核和大脑皮层萎缩，考虑为何种疾病()