风湿性心肌炎最常见的心电图改变是
A．过早搏动
B．心动过速
C．Ⅰ度房室传导阻滞
D．Ⅱ度房室传导阻滞
E．Ⅲ度房室传导阻滞
参考答案：C
Would you please _____ the children _____ with snake?[ ]
A. to ask; not to play
B. ask; not to play
C. ask; not play
D. ask; don’t play
成人潮气量约（）。
