题目

Should parents ever hit their children? Research suggests many of us are likely to respond “no”, and public support for spanking (打屁股) has been falling over the years. But surveys also show that 75 percent to nearly 90 percent of parents admit spanking their child at least once. I was raised in a zero-tolerance( 零容忍) home for disrespect, and my parents often turned to physical punishment. And, no, I don’t feel I was damaged by it. Nothing is more annoying than watching ill-mannered behavior from children. But there is data to suggest that a return to old-school spanking isn下列不属于人体代谢终产物的是（　　）A.二氧化碳B.水C.无机盐D.粪便