布莱克窝洞分类的是根据（）
A.牙的解剖形态
B.窝洞所在的部位
C.龋洞发生的部位
D.不同牙面的功能
E.龋损发生的深度
参考答案：C
The boy asked his father _____. [ ]
A. when would they go to Hong Kong for a holiday
B. who was the television invented by
C. how the life will be like in the year 2100
D. if he could watch TV after finishing his homework
对虚开、代开增值税专用发票的，由于销售事实不存在，不必缴纳税款，只按征管法的规定按偷税给予处罚。( )
