以下哪种因素与牙周病关系不大（）
A.银汞合金充填体有悬突
B.牙齿排列不齐
C.嗜甜食
D.冠修复体不良
E.大量牙石
参考答案：C
选择正确的选项。
1. 妈妈问你口渴吗，她会说： [ ]
A. Who are thirsty?
B. Who is thirsty?
C. Are you thirsty?
2. 当你想问别人想吃些什么时，你会说：[ ]
A. What would you like to eat?
B. What you like to eat?
C. Would you like some food?
下列______不是网络操作系统。
A．Unix
B．NetWare
C．Linux
D．Windows 98
