题目内容：
阅读下列短文,回答题目.It is often difficult for a man to be quite sure what tax he ought to pay to the government because it depends on so many different things：whether the man is married；how many children hehas；whether he supports any relations；how much he earns；how much interest he receives；howmuch he has spent on his house during the year，and SO on and SO forth.All this makes it difficultto decide exactly how much the tax is.
There was a certain artist who was always very careful to pay the properamount.
One year，after posting his check as usual，he began to wonder if he had paid enough，and after a lot of work，with a pencil and paper，he decided that he had not.He believed that he owedthe government something.
He was just writing another check to send to the tax-collector when the postman dropped a letter into the box at the front door.Opening it，the artist was surprised to find inside it a check forfive pounds from the tax—collector.The official explmned that too much had been paid，and thattherefore the difference was now returned to the taxpayer.
It is mentioned in the passage that one has to pay tax according__________. A．how much education one has received
B．whether one is single or married
C．how old one’s children are
D．where one lives
参考答案：
答案解析：