下列哪项特征不是苍白球，黑质病变所致（）
A.肢体震颤
B.双下肢痉挛性瘫痪
C.行动迟缓
D.肌张力呈铅管样增高
E.慌张步态
参考答案：B
受抗原第一次刺激，机体首先产生的特异性抗体是
A．IgG
B．IgM
C．IgA
D．IgE
E．IgD
Jimmy needs to improve his technique if he _____ gold at 2012 Olympic. [ ]
A. wins
B. is winning
C. will win
D. is to win
