4岁小儿，因不会说话来诊，动作发育正常，首选的检查是（）
A.头颅CT
B.声带
C.听力
D.舌系带是否短
E.口腔有无畸形
参考答案：C
十进制数54转换成二进制整数是
A．0110110
B．0110101
C．0111110
D．0111100
____ your leg seriously injured, you have no choice but to lie in bed. [ ]
A. As
B. Because
C. With
D. Since
