竞技健美操成套动作至少要包含以下各组难度动作各一个，动力性力量、静力性力量、（）、（）。
参考答案：跳与跃；平衡与柔韧
— Did you see what the thief looks like?
— No, so quickly_______ that I couldn't see him clearly. [ ]
A. did he run away
B. ran away he
C. does he run away
D. he runs away
以下哪项与IgM抗体不符（）
A.冷凝集素
B.同族血凝素
C.嗜异性抗体
D.能通过胎盘
E.出生时＞0.2～0.3g／L
