注意缺陷多动障碍通常起病于（）
A.3岁前
B.5岁前
C.7岁前
D.10岁前
E.青春期
参考答案：C
—What's her name?
— ____.[ ]
A. She is a girl
B. She is OK
C. Her name is Kate Green
D. She is Green
氧气瓶或减压器冻结时可以使用( )：进行解冻。
A．明火
B．温水
C．炽热铁块烘烤
D．铁器敲击
