综合性医院死亡率参考标准为（）
A.＜2%
B.＜3%
C.＜4%
D.＜5%
E.＜6%
参考答案：C
Percy called me to come to the party, but she herself didn't _____.[ ]
A. show around
B. show up
C. come out
D. put up
涉及下颌前牙区在内的绝大多数牙面快速、广泛的．龋蚀
A．奶瓶龋B．少年龋C．猖獗性龋D．环状龋E．忽视性龋
