下列哪项不是癫痫的先兆症状()
A.头昏
B.心慌胸闷
C.眼花
D.眨眼,点头
E.肢麻恐惧
参考答案:D
It has been confirmed____________he wasn’t the person who stole your bike.
A.if
B.whether
C.why
D.that
催化剂中的基质有什么作用?