与乳牙新生线之矿化薄弱或乳牙牙颈部出生后釉质之矿化度低有关（）
A.奶瓶龋
B.少年龋
C.猖獗龋
D.环状龋
E.忽视性龋
参考答案：D
—What's the noise? It sounds as if it comes from upstairs.
—________. It must be the windowcleaner working next door.[ ]
A. I'm not sure
B. I hope not
C. I'd rather not
D. I don't think so
餐厅服务员正在洗碗，厨师问：来了多少人？ 服务员说：客人每2位共用一吃饭碗，每3位共用一只菜碗，每4位共用一只汤碗，共用去65至晚，你说有多少位客人？
A．50
B．60
C．65
D．75
