There are many ____ in the zoo. [ ]
A. a boy
B. boy
C. boys
答案:C
破伤风发作期出现典型的肌肉强烈收缩,最先表现在
A.咬肌
B.项肌
C.胸肌
D.背肌
E.四肢肌
交叉性栓塞